I ask specifically about the iPhone 4S because it's the one I am looking forward to upgrade. Any downgrades in performance from previous OSes and/or new features that originally weren't coming to the 4S that ended making the cut? Read somewhere on this forum that filters on the camera app were included on this device, even after iOS 7 page, said it was exclusive for iPhone 5 and later devices. Also someone over on the comments section in 9to5Mac was saying that airdrop showed up but he/she could just be dissing at this point. Please share your findings!