Infinity Ward Definitely Developing a Sci-Fi Shooter

[Mifely]

There's lots of milk left in the CoD cow.

Call of Space Marine Duty
Call of Civil War Duty
Call of Ninja Duty
Call of Medieval Crossbowman Duty
Call of Magic Duty

...the list could go on forever... Throw in some funny accents and flashy special FX... cha-ching!