What's the big deal, if IW leaves Activision, it's reason to cheer, not sulk. They are talented developers and there is no doubt that we will see more games from them, publishers will go crazy to buy them when their contract expires.
MY HYPE LIST: 1) Gran Turismo 5; 2) Civilization V; 3) Starcraft II; 4) The Last Guardian; 5) Metal Gear Solid: Rising