I don't own the game but the guys here in the office are telling me that the nuketown2025 map is a multiplayer only map. it has nothing to do with zombies. also it was available only to those who preordered the game. in addition to the map, it was also a double xp weekend and the moshpit option was the only way to get the double xp. now that the weekend is over, the moshpit option is gone. this is the normal process every time they have a double xp weekend. nothing new or special here.