When do black ops zombie map packs come out and how much do they cost?

i want to know when zombie map packs come out for black ops and how much they will cost. thank youWhen do black ops zombie map packs come out and how much do they cost?
no zombie map packs have been announced yet. my guess for their cost is maybe ~800 microsoft points, either that or 1.2k. (which is either 10-15$ or so)



but one thing is for certain, treyarch is already working for multiplayer and zombie map packs. hopefully they come sometime in january.

pearson prentice hall

black ops zombie maps