So from what i have concluded from the trailer, we are gettting the Zombie maps that are relevant to the storyline which include:

-Nacht der Untoten
-Verrckt
-Shino Numa
-Der Riese

-Kino der Toten
-Ascension
-Shangri La
-Moon

Plus the allready included maps which are

-TranZit
-Die Rise
-Buried
-Origins DLC Map (Trenches?)

And the Bonus Map
-Mob of the Dead


So in total we will be getting a 9 Zombie Map DLC! With a Total sum of 13 maps!