Activision has revealed that Black Ops 2 will have 4 map packs released for it during 2013. The new DLCs will include new maps and content for both multiplayer and Zombies mode. Each DLC map pack will be priced at $14.99.
Buying the "Season Pass" for Black Ops II will give you all 4 map packs for $49.99, which saves you about $10 compared if bought them separately. As always, the DLCs will be Xbox 360 exclusives for 30 days.