Yeah, I'm in. Can't wait to try it out.
Note from e-mail:
The Beta includes all of the full game's races, units, and heroes. However, the Beta is playable only through Battle.net. Excluded from the Beta are the following full-game features: single-player mode, multiplayer LAN games, all cinematic sequences, computer opponents, the campaign editor, saving and loading, and several Battle.net features.
No single player or LAN. Oh well.