User blog comment:Cpt. John "Soap" MacTavish/Black Ops Question/@comment-1892823-20100719032402

cod4 evolve into the game that everyone loved than the WW2 era. More people enjoyed the new taste in Cod4 than the past games. So Treyarch says that BO will have a new taste and newer stuff than being stuck in the WW2 era. Also note that Treyarch last WW2 game was WaW which switch to something new like BO. Infinity Ward's last WW2 game is CoD2 which switch into something new and better like CoD4