We've never been great counters, but we'd say there are three studios working on major Call of Duty games now. A recent internal memo (as reported by G4) apparently confirms that Infinity Ward -- despite all of the recent stuff going down there -- will remain "central" to the franchise. So, counting that studio and Treyarch, along with Sledgehammer Games and its own Call of Duty title, that's ... four three! The Count would be so proud of us!

This internal memo reportedly comes from CEO of Activision Publishing Mike Griffith, who said, "Infinity Ward remains central to Call of Duty's future" and that Activision would continue to "rely on the combined talent, expertise and leadership of the team there for [Call of Duty's] success."