iOS 7 clues that suggest iPhone 5s or 6 Hardware Design.
As I watch the iOS 7 beta 1 videos, there are two things that come to mind that Apple could really enhance through hardware.
1) fingerprint sensor: With iCloud keychains, and Passbook, and that new Lost iPhone feature, security is just all over iOS 7. I can absolutely see them adding a fingerprint sensor
2) touch sensitive home button: Gestures are all over this OS. A touch sensitive home button would make it even more convenient to use the new gestures.