It has been confirmed that we are getting a zombie mode in Call Of Duty: Advanced Warfare via future DLC from Activision and Sledgehammer Games but do you really want to wait until then? Of course you don't. Especially since it wouldn't be part of the Season Pass DLC but be a standalone thing for Advanced Warfare. Hopefully you knew all that before you read this so if you wanted the zombie killing action you didn't get primed in other ways.
Back to the not waiting portion though.
Like I said, you most likely don't want to have to wait for the zombies mode for Call Of Duty: Advanced Warfare to be available. Until it is made available it looks like it can be unlocked a bit early through a few steps. Hopefully this is just a small taste and the full DLC gives us much more but here are the few steps you will need to take as well as a video showing off how and what you will get. Here you go to enjoy some zombie action in Call Of Duty: Advanced Warfare.
Call Of Duty: Advanced Warfare — Unlock Zombies
So not to rough but just time consuming. Anyone who is still suffering from the server lag for the multiplayer of Call Of Duty: Advanced Warfare should have the time as I don't believe it is affecting the Exo Survival modes. I am still in the works of a full review for Call Of Duty: Advanced Warfare so I may be a bit behind on those who were able to take the last week off to dig right into the game. None the less though you can at least gain access of some sort to the zombies mode through those few steps. I'd say easy steps but that is all up to your skill level in Advanced Warfare.