As with each DLC release, Activision encourages players of call of duty to join servers at a Weekend to double XP points!
Josh Olin and David Vonderhaar have confirmed via the weekly podcast of Major Nelson that the long awaited weekend of Double XP, will be starting at 10am Friday PST and continuing through 8am Monday PST. In other words, just after the release of First Strike, the new DLC with 4 multiplayer maps.
Good news for the PlayStation 3 and PC, which will have to wait another month to try to First Strike, the double XP weekend that they are also open from 4 to 6 March!