Originally posted by Skyline
^ This, it really wouldn't surprise me if this is the case.
That's my take on it anyway, I read an article full of leaked information before the game came out, and Turned was a mode detailed exactly the same as Turned is now. One of the other modes was called 'Meat', so if that gets released in future DLC, we can pretty much say with 100% certainty that Treyarch had all this stuff waiting in the wings months before the game even came out.