Portal 2, delayed from a 2010 release, won't be out that far into 2011. The game will be out on February 9, according to a tweet from the always-informed Geoff Keighley. He teases more on the game on Game Trailers TV this Friday.
According to a Computer and Video Games report from Gamescom in Germany, Office co-writer and actor Stephen Merchant will do voice acting for Wheatley, the British robot featured in the game's trailers.
Here is some footage of Portal 2 as it was shown at Gamescom today.