Call Of Duty: Black Ops Declassified Will Not Feature Zombies
"This is the first Call of Duty game on Vita, and it needs to deliver on its core strengths - arguably, multiplayer gaming with twin-stick controls in a portable format. That’s the core experience, and that simply needs to come first.
Activision rep Dan Amrich explains a little more on why the mode will be omitted from the final version of the game. Instead of zombies, the game will include a mode caled “Hostiles Mode” where you face off against waves of enemy AI instead of zombies.
Note, this mode was not ruled out as future DLC if there is enough demand for it.