Many of the 4S owner's contract will expire so they might plan on getting the new iPhone... iOS 7 and it's exclusive features for the 5S like fingerprint scanner and others. Better everything that would make many iPhone 5 owners want to get it like a WAY better camera with dual flash and better quality..no more scuffs hopefully and better speakers/microphone. MAYBE even a bigger screen. But the 5S will be the best S model update ever. Quote me when this becomes true.