My iPhone 4S arrived today. I was able to activate it right from iTunes...cool. My first impressions of the camera are quite favorable. It's clear and it's fast.
A favorite Camera App is ClearCam which takes 4 shots quickly, analyzes them and saves the sharpest. With the 4S, ClearCam takes and analyzes 6 shots in exactly the same amount of time. The images are larger, 8MB and they appear to be sharper as well. Not bad for a sensor which is probably about the size of a grain of rice.