The Arduino team"s Tom Igoe was on Adafruit's Ask An Engineer livecast last night. Lots of great details on the new boards and the project's past and future.
The Arduino details start at 6:30 and goes to about 46:30. Lots of good details about the new USB chip, the forthcoming Version 0.20 IDE, and the 1.0 coming after that. Details include:
--.pde file extension will turn to .ade
--3.3v voltage regulator beefed up
--Lots of configurable options in solder jumpers on the bottom
--Bootloader is now the faster, smaller Optiboot. Just 2k
--And lots more on libraries, shields and such