Treyarch has unveiled the debut trailer for their next addition to the hugely popular Call of Duty series, Call of Duty: Black Ops.

It appears that Black Ops will allow players to visit many different time periods and settings; one of which is more than likely to be Vietnam. Vietnam has been rumoured to be in the next Call of Duty game for quite some time now. Judging by the trailer, it seems that at least part of the game will take place there. Gameplay-wise, it is extremely hard to make out any real additions or changes. The trailer hints at an intriguing twist on the Call of Duty styled story too. Some of the sequences suggest that a ex-soldier has been drugged and is being questioned about past events. I suspect players will play though his memory to advance the story. Call of Duty: Black Ops is currently slated in for a November 9th 2010 release date.

Check out the trailer below: