D'après la page FCBK de Black Ops :
We're having another Double-XP weekend, starting March 4th and ending March 7th at approximately 10a PST both days. All Platforms (x360, PS3, PC, Wii) will see 2x the normal earn rate of XP & CP. Don't forget that the PlayStation 3 release of First Strike is March 3rd - Just in time for Double-XP!
Bon pour ceux qui sont pas fan de l'anglais par contre ...