diff --git a/assembly/pom.xml b/assembly/pom.xml
index c65192bde64c6..4e2b773e7d2f3 100644
--- a/assembly/pom.xml
+++ b/assembly/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent</artifactId>
-    <version>1.2.0-SNAPSHOT</version>
+    <version>1.3.0-SNAPSHOT</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
 
diff --git a/bagel/pom.xml b/bagel/pom.xml
index 93db0d5efda5f..0327ffa402671 100644
--- a/bagel/pom.xml
+++ b/bagel/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent</artifactId>
-    <version>1.2.0-SNAPSHOT</version>
+    <version>1.3.0-SNAPSHOT</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
 
diff --git a/core/pom.xml b/core/pom.xml
index 492eddda744c2..1feb00b3a7fb8 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent</artifactId>
-    <version>1.2.0-SNAPSHOT</version>
+    <version>1.3.0-SNAPSHOT</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
 
diff --git a/core/src/main/scala/org/apache/spark/package.scala b/core/src/main/scala/org/apache/spark/package.scala
index e2fc9c649925e..436dbed1730bc 100644
--- a/core/src/main/scala/org/apache/spark/package.scala
+++ b/core/src/main/scala/org/apache/spark/package.scala
@@ -44,5 +44,5 @@ package org.apache
 
 package object spark {
   // For package docs only
-  val SPARK_VERSION = "1.2.0-SNAPSHOT"
+  val SPARK_VERSION = "1.3.0-SNAPSHOT"
 }
diff --git a/docs/_config.yml b/docs/_config.yml
index cdea02fcffbc5..a96a76dd9ab5e 100644
--- a/docs/_config.yml
+++ b/docs/_config.yml
@@ -13,8 +13,8 @@ include:
 
 # These allow the documentation to be updated with newer releases
 # of Spark, Scala, and Mesos.
-SPARK_VERSION: 1.2.0-SNAPSHOT
-SPARK_VERSION_SHORT: 1.2.0
+SPARK_VERSION: 1.3.0-SNAPSHOT
+SPARK_VERSION_SHORT: 1.3.0
 SCALA_BINARY_VERSION: "2.10"
 SCALA_VERSION: "2.10.4"
 MESOS_VERSION: 0.18.1
diff --git a/examples/pom.xml b/examples/pom.xml
index 85e133779e465..c64d3e6d24594 100644
--- a/examples/pom.xml
+++ b/examples/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent</artifactId>
-    <version>1.2.0-SNAPSHOT</version>
+    <version>1.3.0-SNAPSHOT</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
 
diff --git a/external/flume-sink/pom.xml b/external/flume-sink/pom.xml
index ac291bd4fde20..72618b6515f83 100644
--- a/external/flume-sink/pom.xml
+++ b/external/flume-sink/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent</artifactId>
-    <version>1.2.0-SNAPSHOT</version>
+    <version>1.3.0-SNAPSHOT</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/external/flume/pom.xml b/external/flume/pom.xml
index 7d31e32283d88..fae84a31b879c 100644
--- a/external/flume/pom.xml
+++ b/external/flume/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent</artifactId>
-    <version>1.2.0-SNAPSHOT</version>
+    <version>1.3.0-SNAPSHOT</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/external/kafka/pom.xml b/external/kafka/pom.xml
index 2067c473f0e3f..ce74b0b77752c 100644
--- a/external/kafka/pom.xml
+++ b/external/kafka/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent</artifactId>
-    <version>1.2.0-SNAPSHOT</version>
+    <version>1.3.0-SNAPSHOT</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/external/mqtt/pom.xml b/external/mqtt/pom.xml
index 362a76e515938..8c5bd79304e29 100644
--- a/external/mqtt/pom.xml
+++ b/external/mqtt/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent</artifactId>
-    <version>1.2.0-SNAPSHOT</version>
+    <version>1.3.0-SNAPSHOT</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/external/twitter/pom.xml b/external/twitter/pom.xml
index 1d7dd49d15c22..399c30a51a89f 100644
--- a/external/twitter/pom.xml
+++ b/external/twitter/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent</artifactId>
-    <version>1.2.0-SNAPSHOT</version>
+    <version>1.3.0-SNAPSHOT</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/external/zeromq/pom.xml b/external/zeromq/pom.xml
index 7e48968feb3bc..e4539167ce756 100644
--- a/external/zeromq/pom.xml
+++ b/external/zeromq/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent</artifactId>
-    <version>1.2.0-SNAPSHOT</version>
+    <version>1.3.0-SNAPSHOT</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/extras/java8-tests/pom.xml b/extras/java8-tests/pom.xml
index 7e478bed62da7..c8477a6566311 100644
--- a/extras/java8-tests/pom.xml
+++ b/extras/java8-tests/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent</artifactId>
-    <version>1.2.0-SNAPSHOT</version>
+    <version>1.3.0-SNAPSHOT</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/extras/kinesis-asl/pom.xml b/extras/kinesis-asl/pom.xml
index 560244ad93369..c0d3a61119113 100644
--- a/extras/kinesis-asl/pom.xml
+++ b/extras/kinesis-asl/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent</artifactId>
-    <version>1.2.0-SNAPSHOT</version>
+    <version>1.3.0-SNAPSHOT</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/extras/spark-ganglia-lgpl/pom.xml b/extras/spark-ganglia-lgpl/pom.xml
index 71a078d58a8d8..d1427f6a0c6e9 100644
--- a/extras/spark-ganglia-lgpl/pom.xml
+++ b/extras/spark-ganglia-lgpl/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent</artifactId>
-    <version>1.2.0-SNAPSHOT</version>
+    <version>1.3.0-SNAPSHOT</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/graphx/pom.xml b/graphx/pom.xml
index 3f49b1d63b6e1..9982b36f9b62f 100644
--- a/graphx/pom.xml
+++ b/graphx/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent</artifactId>
-    <version>1.2.0-SNAPSHOT</version>
+    <version>1.3.0-SNAPSHOT</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
 
diff --git a/mllib/pom.xml b/mllib/pom.xml
index dd68b27a78bdc..0a6dda0ab8c80 100644
--- a/mllib/pom.xml
+++ b/mllib/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent</artifactId>
-    <version>1.2.0-SNAPSHOT</version>
+    <version>1.3.0-SNAPSHOT</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
 
diff --git a/network/common/pom.xml b/network/common/pom.xml
index 2bd0a7d2945dd..baca859fa5011 100644
--- a/network/common/pom.xml
+++ b/network/common/pom.xml
@@ -22,7 +22,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent</artifactId>
-    <version>1.2.0-SNAPSHOT</version>
+    <version>1.3.0-SNAPSHOT</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/network/shuffle/pom.xml b/network/shuffle/pom.xml
index 12ff034cfe588..12468567c3aed 100644
--- a/network/shuffle/pom.xml
+++ b/network/shuffle/pom.xml
@@ -22,7 +22,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent</artifactId>
-    <version>1.2.0-SNAPSHOT</version>
+    <version>1.3.0-SNAPSHOT</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/network/yarn/pom.xml b/network/yarn/pom.xml
index 7845011ec3200..acec8f18f2b5c 100644
--- a/network/yarn/pom.xml
+++ b/network/yarn/pom.xml
@@ -22,7 +22,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent</artifactId>
-    <version>1.2.0-SNAPSHOT</version>
+    <version>1.3.0-SNAPSHOT</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/pom.xml b/pom.xml
index 94c4422743df3..6c1c1214a7d3e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -26,7 +26,7 @@
   </parent>
   <groupId>org.apache.spark</groupId>
   <artifactId>spark-parent</artifactId>
-  <version>1.2.0-SNAPSHOT</version>
+  <version>1.3.0-SNAPSHOT</version>
   <packaging>pom</packaging>
   <name>Spark Project Parent POM</name>
   <url>http://spark.apache.org/</url>
@@ -254,6 +254,18 @@
         <enabled>false</enabled>
       </snapshots>
     </repository>
+    <!-- TODO: remove this as soon as 1.2.0 is published on Maven central -->
+    <repository>
+      <id>spark-staging-1038</id>
+      <name>Spark 1.2.0 Staging (1038)</name>
+      <url>https://repository.apache.org/content/repositories/orgapachespark-1038/</url>
+      <releases>
+        <enabled>true</enabled>
+      </releases>
+      <snapshots>
+        <enabled>false</enabled>
+      </snapshots>
+    </repository>
   </repositories>
   <pluginRepositories>
     <pluginRepository>
@@ -269,7 +281,7 @@
   </pluginRepositories>
 
   <dependencies>
-  <!-- 
+  <!--
        This is a dummy dependency that is used along with the shading plug-in
        to create effective poms on publishing (see SPARK-3812).
   -->
@@ -278,7 +290,7 @@
       <artifactId>unused</artifactId>
       <version>1.0.0</version>
     </dependency>
-    <!-- 
+    <!--
          This depndency has been added to provided scope as it is needed for excuting build
          specific groovy scripts using gmaven+ and not required for downstream project building
          with spark.
diff --git a/project/MimaBuild.scala b/project/MimaBuild.scala
index d919b18e09855..f0cbf4e57b8c5 100644
--- a/project/MimaBuild.scala
+++ b/project/MimaBuild.scala
@@ -30,7 +30,7 @@ object MimaBuild {
 
   def excludeMember(fullName: String) = Seq(
       ProblemFilters.exclude[MissingMethodProblem](fullName),
-      // Sometimes excluded methods have default arguments and 
+      // Sometimes excluded methods have default arguments and
       // they are translated into public methods/fields($default$) in generated
       // bytecode. It is not possible to exhaustively list everything.
       // But this should be okay.
@@ -91,9 +91,9 @@ object MimaBuild {
 
   def mimaSettings(sparkHome: File, projectRef: ProjectRef) = {
     val organization = "org.apache.spark"
-    val previousSparkVersion = "1.1.0"
+    val previousSparkVersion = "1.2.0"
     val fullId = "spark-" + projectRef.project + "_2.10"
-    mimaDefaultSettings ++ 
+    mimaDefaultSettings ++
     Seq(previousArtifact := Some(organization % fullId % previousSparkVersion),
       binaryIssueFilters ++= ignoredABIProblems(sparkHome, version.value))
   }
diff --git a/project/MimaExcludes.scala b/project/MimaExcludes.scala
index 8a2a865867fc4..6ab2d1b04cc87 100644
--- a/project/MimaExcludes.scala
+++ b/project/MimaExcludes.scala
@@ -33,6 +33,16 @@ import com.typesafe.tools.mima.core._
 object MimaExcludes {
     def excludes(version: String) =
       version match {
+        case v if v.startsWith("1.3") =>
+          Seq(
+            MimaBuild.excludeSparkPackage("deploy"),
+            MimaBuild.excludeSparkPackage("graphx"),
+            // These are needed if checking against the sbt build, since they are part of
+            // the maven-generated artifacts in the 1.2 build.
+            MimaBuild.excludeSparkPackage("unused"),
+            ProblemFilters.exclude[MissingClassProblem]("com.google.common.base.Optional")
+          )
+
         case v if v.startsWith("1.2") =>
           Seq(
             MimaBuild.excludeSparkPackage("deploy"),
diff --git a/project/SparkBuild.scala b/project/SparkBuild.scala
index c1879ce4ba0eb..efc48e7f67349 100644
--- a/project/SparkBuild.scala
+++ b/project/SparkBuild.scala
@@ -210,12 +210,14 @@ object OldDeps {
 
   def versionArtifact(id: String): Option[sbt.ModuleID] = {
     val fullId = id + "_2.10"
-    Some("org.apache.spark" % fullId % "1.1.0")
+    Some("org.apache.spark" % fullId % "1.2.0")
   }
 
   def oldDepsSettings() = Defaults.coreDefaultSettings ++ Seq(
     name := "old-deps",
     scalaVersion := "2.10.4",
+    // TODO: remove this as soon as 1.2.0 is published on Maven central.
+    resolvers += "spark-staging-1038" at "https://repository.apache.org/content/repositories/orgapachespark-1038/",
     retrieveManaged := true,
     retrievePattern := "[type]s/[artifact](-[revision])(-[classifier]).[ext]",
     libraryDependencies := Seq("spark-streaming-mqtt", "spark-streaming-zeromq",
@@ -385,7 +387,7 @@ object TestSettings {
     javaOptions in Test ++= "-Xmx3g -XX:PermSize=128M -XX:MaxNewSize=256m -XX:MaxPermSize=1g"
       .split(" ").toSeq,
     // This places test scope jars on the classpath of executors during tests.
-    javaOptions in Test += 
+    javaOptions in Test +=
       "-Dspark.executor.extraClassPath=" + (fullClasspath in Test).value.files.
       map(_.getAbsolutePath).mkString(":").stripSuffix(":"),
     javaOptions += "-Xmx3g",
diff --git a/repl/pom.xml b/repl/pom.xml
index c2bf9fdfbcce7..9b2290429fee5 100644
--- a/repl/pom.xml
+++ b/repl/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent</artifactId>
-    <version>1.2.0-SNAPSHOT</version>
+    <version>1.3.0-SNAPSHOT</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
 
diff --git a/sql/catalyst/pom.xml b/sql/catalyst/pom.xml
index 686d189d810a8..1caa297e24e37 100644
--- a/sql/catalyst/pom.xml
+++ b/sql/catalyst/pom.xml
@@ -22,7 +22,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent</artifactId>
-    <version>1.2.0-SNAPSHOT</version>
+    <version>1.3.0-SNAPSHOT</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/sql/core/pom.xml b/sql/core/pom.xml
index bd110218d34f7..3bd283fd20156 100644
--- a/sql/core/pom.xml
+++ b/sql/core/pom.xml
@@ -22,7 +22,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent</artifactId>
-    <version>1.2.0-SNAPSHOT</version>
+    <version>1.3.0-SNAPSHOT</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/sql/hive-thriftserver/pom.xml b/sql/hive-thriftserver/pom.xml
index 8db3010624100..490cfbce654d7 100644
--- a/sql/hive-thriftserver/pom.xml
+++ b/sql/hive-thriftserver/pom.xml
@@ -22,7 +22,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent</artifactId>
-    <version>1.2.0-SNAPSHOT</version>
+    <version>1.3.0-SNAPSHOT</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/sql/hive/pom.xml b/sql/hive/pom.xml
index fa9a1e64b0f80..f6805b942153a 100644
--- a/sql/hive/pom.xml
+++ b/sql/hive/pom.xml
@@ -22,7 +22,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent</artifactId>
-    <version>1.2.0-SNAPSHOT</version>
+    <version>1.3.0-SNAPSHOT</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/streaming/pom.xml b/streaming/pom.xml
index 12f900c91eb98..b8b8f2e6cab65 100644
--- a/streaming/pom.xml
+++ b/streaming/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent</artifactId>
-    <version>1.2.0-SNAPSHOT</version>
+    <version>1.3.0-SNAPSHOT</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
 
diff --git a/tools/pom.xml b/tools/pom.xml
index b90eb0ca250c5..c0bc6e2a2af9d 100644
--- a/tools/pom.xml
+++ b/tools/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent</artifactId>
-    <version>1.2.0-SNAPSHOT</version>
+    <version>1.3.0-SNAPSHOT</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
 
diff --git a/yarn/alpha/pom.xml b/yarn/alpha/pom.xml
index 7dadbba58fd82..40e9e99c6f855 100644
--- a/yarn/alpha/pom.xml
+++ b/yarn/alpha/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>yarn-parent_2.10</artifactId>
-    <version>1.2.0-SNAPSHOT</version>
+    <version>1.3.0-SNAPSHOT</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
   <properties>
diff --git a/yarn/pom.xml b/yarn/pom.xml
index 2885e6607ec24..bba73648c7abe 100644
--- a/yarn/pom.xml
+++ b/yarn/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent</artifactId>
-    <version>1.2.0-SNAPSHOT</version>
+    <version>1.3.0-SNAPSHOT</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
 
diff --git a/yarn/stable/pom.xml b/yarn/stable/pom.xml
index fe55d70ccc370..8b6521ad7f859 100644
--- a/yarn/stable/pom.xml
+++ b/yarn/stable/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>yarn-parent_2.10</artifactId>
-    <version>1.2.0-SNAPSHOT</version>
+    <version>1.3.0-SNAPSHOT</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
   <properties>