I doubt they will change the width, there must be 1000's of apps that will break or look wrong if they change that (without updating).
They almost certainly have something their sleeve to hype that they can claim competitors don't have. If they just make the screen bigger and some minor changes to the case, they will just be seen as playing catch up.
Those are all relatively absurd examples. They tried the integrated-service route with Ping, and it was an unmitigated failure. What could they possibly do with the sound or the material?
Something tells me I'm going to be severely underwhelmed in a week or so.