Not a zombie mode, but they will have Spec Ops from Modern Warfare 2 back with a new addition called 'Survival Mode'. It is a wave based game with enemies that get increasingly more difficult, but they have gun and are regular soldiers. You also have dogs, killstreaks, matchmaking, a ranking system, etc. It is played on multiplayer maps instead of single player maps. It is currently only for two players online, solo, or splitscreen.