I'm starting to wonder if the bigger narrative that Apple will promote will be a home button that responds to pressure and taps like a trackpad. Think how useful it would be to double-tap to bring up the app switcher, instead of clicking on that easily-breakable, archaic button. Or simply leaving your thumb in place to bring up Siri. Then Apple can promote the 5S as a "revolutionary" way to interact with your phone. Fingerprints/security/payments as a secondary selling point.