The Control Center seems like it will make changing basic settings a bit easier. But I wonder if the 4 buttons at the bottom will be customizable, it looks like they're pre set to flashlight, timer, calculator and camera.
still playing catch up with android and mimics UI of WP8 now, kinda funny..but yes, very pretty. I moved from the iPhone after the 4S....felt so bored. Much happier with my android (HTC One) and Windows Phone (Lumia 920)
Yup you want the GSM one. The CDMA ones are for some Americans.
Anyways I have it installed on a 4S and it feels, well it feels different that's for ure. The miltitasking is a direct copy of Windows Phone. The control pannel feels like something out of Android but other than that it feels a lot fresher. It is slow on the 4S right now because it is a beta and should be faster for release. But in all I think it is great and shows the amount of work you can pull off in like 6 months.