Cthulhu on 16 September 2008
"Following publisher Activision's "leapfrog strategy" of alternating developers, Infinity Ward's Call of Duty 6 will follow up Treyarch's Call of Duty: World at War, which launches on November 5 for PC, Xbox 360, PlayStation 3, PS2, and Wii. Treyarch had also developed Call of Duty 3 as a part of that strategy."
Crappy duty 6 confirmed
