For the entirety of the last generation, the Call of Duty series was run under a two studio set-up with Treyarch and Infinity Ward alternating on a two year schedule. Now Activision has announced that three studios will be involved in the franchise, each on a three year schedule, in order to maintain quality whilst churning out a game a year.
Those three studios will be Treyarch, Infinity Ward and Sledghammer games.
Activision has something of a history of bleeding its key franchises dry, with Tony Hawk and Guitar Hero being prime examples, but it has done an incredible job of maintaining the momentum of Call of Duty over a seriously long period of time. The three studio system may actually end up working in Activision's favour. It may also end up in the quality bar being raised, with each team being given more time to create each game.
Bobby Kotick claimed that he expected Sledgehammer's Call of Duty game to be "one of if not the best" Call of Duty game yet. But he would say that, wouldn't he!
It'll be interesting to see how the super successful Call of Duty series makes the transition to next generation consoles.