Source: cod offical facebook.Rank up in Modern Warfare 2 and Black Ops during this weekend’s Double XP event. You will unlock a Prestige Token in Call of Duty: MW3 for every Call of Duty you've prestiged in since Call of Duty 4: Modern Warfare.
Also i dont want any bf3 vs mw3 crap, just giving a heads up to those that just wanna play what we wanna play.