Apparently there was a live webcast of the Activision Blizzard' conference, and Starcraft 2 was said to release before the end of 2009.

http://e3.gamespot.com/story/6210427/starcraft-ii-by-end-of-2009-call-of-duty-expanding-to-new-genres?tag=top_stories;story;1

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Q u o t e:
[6:55] There will be a Starcraft II beta test later this summer, and Morhaime offers to get anyone in attendance into the program. Morhaime expects to launch Starcraft II by the end of the year, though also notes that it will only ship once the game is done.

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Hope you guys are enjoying the E3 coverage there :) The info should give you guys some more insight on the timeline we are shooting for - while still putting game quality at the highest priority though.