Iíve just made a release of CDK 1.5.5. This is a developer (unstable) release and includes a couple of new features.
Maven artefacts: available soon (currently deploying)
We getting very close to the stable 1.6.- series. The next release will be quite soon and introduce separate source trees for the cdk modules and start using maven to build the project. This means file locations will move but we will still be able to apply patches from the old single source tree structure.