Whenever it gets released I sure do hope it will run as smooth as iOS 7 does on the 4S. Will it and has it been tested on one? I do not want my phone to be slower, I want it at the same speed it is today. This one I may not jump right on as I did with iOS 7 but may wait a while. Hence I know people that are still running IOS 5 on their phones and have no upgraded for whatever reason.