4 vital ways Sledgehammer can improve Call of Duty

Every Call of Duty game will have a three-year development cycle, with Treyarch, Infinity Ward and now Sledgehammer taking it in turns to release one. Sledgehammer's arrival as a studio for the biggest franchise out there could mean more of the same, or it could mean that we finally get to see a bit more innovation added to the shooter, which is starting to show signs of slowing down.