STaRzZ_HDI wrote no i dont think that they are copying the zombies tbh the zombies is a all round game mode originally it was not treyarcs idea the first ones to ever use this was the makers of left for dead thats where treyarc got the idea from to add zombies in to there game mode but changing the theme just a little bit so it was set in a war zone with the uprising dead soldiers

But No because left for dead did not use do the survival DLC Till cod 5 zombies was such a big hit

No, They're not copying Zombies, They are doing Spec-Ops like they did in Modern Warfare 2.