Here’s the trailer, and the link to the official site is after the embedded video.
Official Site: http://modernwarfare2.infinityward.com/
Just so you know, the official site is just showing the trailer, but that’s where a lot of info will be appearing over time. I am a huge fan of Call of Duty: Modern Warfare and I really can’t wait to find out more about the sequel. This is going to be a huge holiday hit when it drops in November.