I can't believe that no one is talking about this game on here. I haven't played the first one, but the videos of the sequel on Gametrailers have my pretty hyped up. I think that they said it would be releasing this winter, probably early 2010.
Co-op Boss Gameplay
http://www.gametrailers.com/player/50396.html
Extended Trailer
http://www.gametrailers.com/player/50619.html
http://www.gametrailers.com/player/50396.html
Extended Trailer
http://www.gametrailers.com/player/50619.html