In a recent message to Twitter user 'jbkrc', Infinity Ward's Robert Bowling has revealed that in Modern Warfare 2's campaign, the player will experience 'multiple perspectives' - suggesting that like COD4, there will be more than one soldier's boots to fill.
intrepid34/jbkrc:THE SECOND MESSAGE IS REFERRING TO THE RELEASE DATE OF INSIDE XBOX, NOT MW2.
I had to create a blog to post the screen-capture of the message, it was the easiest way to show it's legit :)