Hi - there are no plans for further work on the RDK (sorry!) The most extensive code samples that are available are C++ (SDK) and C# (from the AMT DTK source code). Also much of the DTK is being rewritten to use the WS MAN interface which also may be of help since WS MAN is the direction that the SDK is going in the future.
The SDK will be getting more Java Samples, but at this time I cannot say which ones will be provided. I'm sorry I couldn't give you the answer that you wanted to hear.