September 5ht: The Beat Goes On

If this was only a rumor so far, Apple officially announced that a Special Event entitled "The beat goes on" will take place on September 5th at the Moscone Center, San Francisco, starting 10h00 local time, 19h00 CET.
Based on the cover, there is no risk predicting an update of iPod models:

So, what could be the product that Steve will unveil at the Apple Expo?