Developer Treyarch has announced that this weekend will be a Double XP Weekend for the Wii U version of Call of Duty: Black Ops 2. As you can see from the image above, this promotion is only for owners of Nintendo's new console. I haven't seen this mentioned on any of the other Wii U websites. Guess it kind of slipped through the cracks.
Here are the official details:
It's time to shine a spotlight on some different game modes.
All weekend long players can jump into our featured playlist and earn Double XP on the Wii U!
The featured playlist for this weekend: MULTI-TEAM
This will start 3/15 around 11am PST and end 3/18 around 11am PST.
Source: Call of Duty Community