Treyarch has announced via the Message of the Day that Black Ops 2 will be having a double XP weekend, this weekend from Jan 25th (at 10am PST) to Jan 28th (at 10am PST). This is to go along with the launch of Nuketown Zombies for PS3/PC (Season Pass).
And with Double XP, they will also have Nuketown 24/7 for the weekend!
Are you planning on prestiging this weekend?
There should also be another for the release of the map pack the following weekend.