Microsoft is cranking out the information this month and we're even getting some new files. The Avalon and Indigo Community Technology Preview for March has been released. This is the first release of Indigo since the PDC. Again, Avalon is the new UI system for windows forms applications. Indigo is the next generation of communication that will replace web services. It does not include a release of Visual Studio, so I think it requires the use of command line compilers and fun stuff like that. This release is built upon the February CTP version of the framework, so if you want to mess with it you will probably be best using a virtual machine.
If you want to know a bit more about Indigo, take a look at the FAQ here.
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