Version details go JSON (dartbug.com/3196).

editor/tools/features/com.google.dart.tools.deploy.feature_releng/build_rcp.xml

 <!--
 This build script will build the Dart RCP and Dart update site.  
 
 This script will setup the PDE build structure and then call into the PDE
 build system.  The PDE build system has to run under Eclipse.
 -->
 <project name="build_dart" default="build_rcp">
     
     <import file="build-common.xml" />
 
@@ skipping 436 matching lines @@
           target: package_rcp                      
          - - - - - - - - - - - - - - - - - -->
     <target name="package_rcp" depends="init, setupBuild, doBuild_rcp" >
         <property file="build.properties" prefix="pde." />
         <echo message="copying zip files from ${build.stage}/${pde.buildLabel} to ${build.out}"/>
         <copy todir="${build.out}" verbose="true">
             <fileset dir="${build.stage}/${pde.buildLabel}">
                 <include name="*.zip" />
             </fileset>
         </copy>
+        <!--
+          {
+            "revision" : "9826",
+            "version"  : "0.0.1_v2012070961811",
+            "date"     : "2012-07-09"
+          }
+        -->
         <echo message="creating build VERSION file"/>
-        <echo file="${build.out}/VERSION" message="${build.revision}${line.separator}"/>
+        <!-- TODO(pquitslund): add version string info -->
+        <echo file="${build.out}/VERSION">{ 
+  "revision": "${build.revision}",
+  "version" : "",
+  "date"    : "${build.date}"
+}</echo>
     </target>
 
     <!-- - - - - - - - - - - - - - - - - - 
           target: doDeploy_rcp                      
          - - - - - - - - - - - - - - - - - -->
     <target name="doDeploy_rcp" depends="init, setupBuild, doBuild_rcp, package_rcp">
     </target>
 
 </project>