2 Zombies Maps would consist of a "Map Pack" since it's a "Pack" of "Maps"
^ Sure it could mean that.
However let's remember that Activision likes to sell "season passes".
It would be pointless to ever buy a Treyarch season pass again if you don't play zombies, and there's a lot of people out there that don't play zombies... --- "Pretty Women Make Us Buy Beer. Ugly Women Make Us DRINK BEER!" - Al Bundy (12/14/2010 = All time Worst Patch in the History of Gaming!)
If they release a zombie only DLC I will complain to Microsoft. I did not buy the season pass for that zombie BS and I know that most people feel this way too and will do the same. If it is indeed true they would have no choice but to give us full refunds.