I've been doing a lot of research concerning this game. The hype is outrageous. I've seen some previews of the multiplayer and so far sees like a winner. I've also read some of the perks. The perks is what I'm excited about. The entire perk system seems much more balanced and customizable than in Modern Warfare 2. There is no more Stopping Power, which basically frees up Tier 2. All of the perks seem like they would be handy at some point or another in a match.
They graphics also have a very crisp look to them. I've been highly disappointed with the current trend of games lately. The seems to like these bulky almost unreal people that populate these games. I much prefer the crisp, sharp graphics of olden games.
Here are some videos:
I am very excited to see how they managed to balance all of these additions and changes in the gameplay. Of course, don't expect a perfect game from launch, as most people do. Patches will come out and fix game-breaking issues.