MW3
New features:
Survival Mode (Combat training meets zombies, so creative)
Snipers as secondaries (Campers gone wild)
Dog tag pick ups after kills for them to count (holy shit it's Crysis 2)
Drone bots and spot helicopters (HOOLLLY SHIT HOMEFRONT)
Certain killstreak sets give you perks as you gain kills (No more team players, as well as more camping)
Weapon leveling. Your weapon levels and gains the weapon its own perk as you get better at it and use it more (big bite off of BFBC's weapon star system)
I think they've bitten off of every popular FPS there is.