Beyond the discovery earlier today of biometric and fingerprint-sensor data buried inside the latest beta of iOS 7, researchers examining the new update have found lots of other tweaks and refinements -- everything from the return of Apple TV iTunes music buying to a subtle shift in gradient on the Mail icon, and much more. The evolution of iOS 7 reinforces early comments from veteran developers that every design element in the first beta that was publicly demonstrated at the Worldwide Developer's Conference wasn't set in stone, and that the update would evolve.
