The much-anticipated (as anticipated as a multiplayer map can get) Call of Duty: Black Ops 2 Nuketown Zombies map is finally out today, losing its status as a Collector's Edition exclusive. Well, you still need to be a DLC Season Pass holder for access, not to mention an Xbox 360 owner.
Said Season Pass is still available for purchase, allowing Black Ops 2 fans to pre-pay for four upcoming map packs at a discounted price of $49.99; full price would probably be $60, given Activision's habit of charging $15 per pack. Nuketown Zombies isn't actually included, since it was added post-release as a bonus map.
In addition to all that, pass holders also have a special in-game calling card, which can be pretty neat, assuming you're into that sort of thing.
Nuketown Zombies trailer - YouTube