Recently, there have been several videos on YouTube showing the possible maps for the next map pack. The way this has been found is by going into the Community section in Theater Mode. From there, you filter the clips, and as you go through the maps, the names Hotel, Icebreaker, Outskirts, Cubatown, and Cargo.
Random Video out of many regarding this subject: http://www.youtube.com/watch?v=35X_DPdT1_A&feature=related
Now, although I have no proof for this, people are saying that Map Pack 2 will be announced this week (3/21/11-3/28/11).
So, any ideas on what this map pack may contain? Outskirts could be a remake of the WAW map. There is currently no word on any Zombie map.