If you are a subscriber to game informer, the december issue talks ALL about this game.
I will give a little insight so some of you do not flame.
This game uses the same engine as assassin's creed. That is also the reason why it's taken over 3 years for them to release a game. Because they have been HEAVILY modifying the game engine.

Ubisoft Montreal wanted to stay away from your generic middle eastern/Russian/chinese world war III scenario. So they decided the wanted to bring the game home to us. Yes we are fighting terrorists but they are fellow Americans called "The True Patriots". This group is formed by political extremists that are fed up with the American government. so they take matters into their own hands.

In this game you will be forced to make decisions. (many of them) An example of the options you can take are seen in the video below. When he has to decide what to do with the banker. You will have to sacrifice hundreds of lives to save one, or will you make the life of one and save thousands. Those choices are yours to make.

They take an off beat approach from their past games. They want you to see the WHOLE perspective to see why these people are doing what they are doing. maybe to sympathize with them IDK. But unlike past games you will be able to play as the terrorist (The True Patriots", the civilians they affect and the 6 team.

Watch the video of this and tell me what you think.