While the announcement gives no details on the game, it has long been rumoured that Treyarch's next Call of Duty title would be set in the Vietnam War era. PC, Xbox 360 and PlayStation 3 releases should be expected, considering the franchise's history.
While all seems in order at Treyarch, its sister studio--Call of Duty creator Infinity Ward--is in turmoil. After the studio's co-founders Vince Zampella and Jason West were fired by owner Activision in March, a large proportion of its staff quit--many to join West and Zampella's new studio, Respawn Entertainment. Activision is now being sued by thirty-eight current and former employees for unpaid royalties plus damages.
We'll no doubt learn more about Call of Duty: Black Ops on GameTrailers TV tonight.