Whew, I'm feeling a bit overwhelmed with the amount of work I have ahead of me for xajax 0.5 and Willowgarden DP2. Not that it's particularly difficult or time-consuming compared to the work I've already done, but in both cases the work requires a singularly focused and specific train of thought, which is tricky to keep up for long.
In the case of xajax 0.5, we're looking at the most substantial and architecture-altering upgrade in the entire history of the project. want 0.5 to provide an incredible platform for a huge ecosystem of innovation around the Ajax concept, and it's going to take a huge amount of design precision to make that happen.
As for Willowgarden, Developer Preview 1 was a decent first start, but there's a ton of work still to do - a lot of which isn't even code related. I need to get the wiki up and running and start writing How To's and the beginnings of a real User's Guide.
He also includes specific mentions of new features for each. In xajax, a hot-swappable plugin system, and for Willowgarden, the development of unit tests and some more sample applications.