Oh, man. Seems like they are releasing a new version every other week. I should come up with a better way to "automatically" upgrade my build scripts (and, I have many of them) in some way.... Good new and bad news for me. :)
...
<property environment="myenv" />
<property name="gae.sdk.dir" value="${myenv.GAESDK_HOME}"/>
...
<target name="copyGAEJars">
<copy todir="${warLibDir}" overwrite="true" flatten="true">
<fileset dir ="${gae.sdk.dir}/lib/user">
<include name="**/*.jar" />
</fileset>
</copy>
</target>
....