With Modern Warfare 2 being out, Infinity Ward is already working on the "next instalment" of the series, Call of Duty: Modern Warfare 3, where you take on the role of PVT. Keeshon Lewis.
There will also be a Wii version of the game that includes a 17-pound advanced warfare controller, that's shaped like a M-249 Machine Gun. Check out the video for some "gameplay" footage.
Edit: It seems that this video has confused many people, so to clarify, this is just a joke. There will be a Modern Warfare 3 in the distant future, but before that Treyarch will be releasing the next COD game, just like after COD4 (Call of Duty 4).
Treyarch's next Call of Duty game will take place in Vietnam. Checkout the cool new perks in Black Ops.