Ok, here is some more information for you.
After the 1.3.6 and 1.4 releases of World Wind, NASA development of the .Net version of World Wind will stop for now and all efforts will be towards the Java version of World Wind which has a "hard deadline" of December for a release. This will most likely be an Alpha release of the Java code.
Why no more future .Net development? Mainly customer demands on development and a lack of getting support from a "Fortune 100 company". Does this mean no more WW.Net? No. I have been talking with the people at NASA about the community becoming the primary developers leading the WW.Net advancement (WW.Net needs to be supported for at least 2 more years). This doesn't mean that NASA is out of the WW.Net development picture, we would still work closely with this in development. This will be worked out more after the 1.4 release.
Ok, so what about WW Java then? For the time being it is a closed development cycle. You can download the source, compile it, play with what is there, make changes.. but that is it. You can't submit you're changes back in to the SVN. Because of the client for development, more control of the source development is needed. This is also understandable and can work the same way that the Linux kernel development does. The closed tree is controlled by NASA and there can be an OS tree of the SVN that developers can make changes too and submit their code. Then the NASA developers can check and bring what OS Tree code works back into the NASA tree of development. This is also still in the "hey we could do this" category.
There is no reason both of the above couldn't / wouldn't happen. No one is pressuring anyone right now on this (other than the "When will the 1.3.6 and 1.4 beta's come out?" questions) and it would likely be December before any of this would happen.
As more information comes to light, I will pass it on.