Call of Duty fansite Digital Warfare has dug up a blurry promotional image detailing possible content for a new map pack. It lists the following maps: Hangar 18, Drive-In, Silo, Hazard, a new zombie level.
That is all that can be made out though. A similar image was leaked before the announcement of the last map pack, and since this is altogether too dull a rumor to make up, the odds for this being legit are probably pretty big.
Still, a healthy dose of skepticism is always good regarding the internet. We’ll look for official confirmation in the near future.