Pre-ordering Modern Warfare 3 gets you early access to the open beta, coming to PlayStation before other platforms, and access to the campaign a week earlier than everyone else. You'll also get some KontrolFreek thumbsticks if you order the game exclusively through Walmart.
How to play Call of Duty: Modern Warfare III in early access. Although the game gets its worldwide release on November 10, the game can be played for many from November 2 (Thursday.) To play early all you have to do is preorder the digital edition of the game. It does not matter which edition of the game you preorder.