User blog comment:Damac1214/Black Ops II Map names leaked + Vonderhaar tweets a little bit about Weapon Leveling + Zombies Campaign apparently confirmed/@comment-1829940-20120916220900/@comment-1829940-20120916221935

Well, from what I've heard, the code for the map will be included in the game case itself, so the first however many copies will have it, regardless if you pre-ordered. It's happened with other games before so I wouldn't be surprised if this was also the case.