Activision have just announced that their blockbuster franchise, Call of Duty will be changing over to a three year cycle model now that Sledgehammer are working on their own Call of Duty project. The series has been using a two year cycle, with Treyarc and Infinity Ward alternating between releases each year. With the new development team, there will now be an extra year of leeway for game designers to innovate and expand their visions.