This year's Call of Duty game - could it be Call of Duty: Black Ops 2? - will see "meaningful innovation" for the well-worn FPS juggernaut, Activision has said.
Call of Duty Modern Warfare 3 failed to match up to the UK sales record set by 2010's Call of Duty: Black Ops, according to data released by ERA.
FPS titles dominate Microsoft's listings for the most-played games on Xbox LIVE for 2011, with Call of Duty titles occupying the top three slots.
Call of Duty: Black Ops Zombies, adapted from the console hit and built specifically for tablets and smartphones, features the Kino der Toten map and 50 levels of Dead-Ops Arcade.
Activision's Call of Duty: Modern Warfare 3 sold just under two million units during its first five days on sale in the UK, according to data released by Chart Track.