Now this gets interesting! Despite sites claiming that the game definitely was Call of Duty: Vietnam earlier, PC Gamer reveal that the site for Call of Duty: Black Ops is now live, though impossible to actually get into. And they claim that when the "Black Ops" rumour originally broke, it was a Cold War game with missions from all across that period culminating "in the famous 1980 storming of the Iranian Embassy in London by the SAS". Who is right? Who is wrong? We'll know tonight when the trailer rolls. My money's on Call of Duty: Shaking That Booty, where Activision cross two of their biggest franchises in a shooting/rhythm-action game.
UPDATE: Black Ops confirmed. But will it be a Vietnam black ops/cold war black ops/booty-shaking ops game? You have to suspect Cold War. A Vietnam Black Ops game would be... questionable.