Historically Call Of Duty has been produced by two studios; Treyarch and Infinity Ward. Now they are now adding another studio to the roster. Who is this studio? Sledgehammer Games, who also helped on MW3! The change is due to the quality issues associated with big game franchises.
Activision has announced a new three-year development cycle for upcoming Call of Duty games, starting with this year's release. This move, which will still see individual Call of Duty games coming out annually, cements Sledgehammer Games as one of Activision's primary Call of Duty developers alongside Infinity Ward and Treyarch, which are respectively responsible for Call of Duty: Ghosts and Call of Duty: Black Ops 2. Each studio's game will take three years to develop, staggered for release on an annualized schedule.