"Leaked" Left 4 Dead 2 Trailer

I searched the topics and didn't see anything about this, so for those of you who haven't seen this, here you go.

http://www.youtube.com/watch?v=u39KZJIJ7VA

It looks like it will be a great game.

Yeah, the game looks pretty killer. I might get this game though, not sure, as there are other titles I am most wanting to get.