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There's no announced release date. Blizzard is notorious for that: they don't announce a product until it's well into development, and then they develop it for years and only announce the release date when they basically have a finished product. I wouldn't expect SC2 to come out until Christmas 2009. It hasn't been terribly long since they officially announced the game, and they're going to release Wrath of the Lich King for WOW before SC2 comes out. They won't release two massive games like those anywhere near each other. They'll give WLK sales a chance to slow before SC2 comes out.
 
also Diablo III has been announced. so the Blizzard programmers are going to be insanely busy with 3 games to work on. Plus Blizzard is notorious for missing their launch dates by 2-6 months...
 
And they are also working on an "unannounced titled" aswell.

http://www.blizzard.com/us/jobopp/

New Position – User Interface Artist – Unannounced Title
Blizzard Entertainment is looking for an exceptionally skilled individual to assist in the conceptualization and implementation of a unique user interface for an unannounced online multiplayer game. The ideal candidate will possess outstanding aesthetic design, illustration, and animation skills and an innate understanding of intuitive human interface principles. This is an innovative concept requiring a creative approach that breaks new ground in playability and presentation. Blizzard Entertainment offers a fun, creative, and technically challenging environment with excellent compensation and a full range of benefits. For more information, check out the job posting.
 
Huh, I didn't know about the unannounced game.

Geez, we're not going to see any of these games in the next decade...
 
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