According to this image the first DLC will include 4 multiplayer maps and as we expected it has also a zombies map, Die Rise!
Also, there's this new gun, another SMG, the Peacekeeper. I hope it's a great gun, that we can use and be happy that we bought that.
Keep in mind guys, this is pure rumors, it's going to be a while until Activision declares real stuff, and as you expect, we'll be updating this thread's posts.
