My PDC envy is slightly abated...now I'll just have to get a new test machine (VMWare is cool and all, but you can't beat dedicated). Anyway, read all about it here at Bink. I really can't wait to play with some of the new Avalon stuff...This appears to be for MSDN subscribers only (force your company to subscribe - for UK companies, check out this for a great offer - basically 5 MSDN Universals for £520 !)
UPDATE:  Someone  should get a 'build sweepstake' going...guess what build version this gets to before release (5001 is my guess) - with great prizes for the winners!