Modern Warfare 2 campaign launches a week before the full game 

The Call of Duty Modern Warfare 2 campaign will launch technically one week prior to the full game.

However, digital pre-orders will allow you to play the campaign beginning October 20 

This is well before the full game launches on October 28 

Activision announced that you will be able to access the beta for the game two days before the full game launches 

Call of Duty has a long history of offering pre-order incentives.

Modern Warfare 2's Final Judgement bonus bundle includes a legendary Operator skin 

as well as a weapon blueprint for Vanguard or Warzone