Apple is notorious for their little to no updates on each next device they put out. The only real change they made from the 4s is a move from a 3.5 inch screen to a 4 inch screen, it has the same processor as the 4s did. I do have to hand it to apple that the chassy for the 5 is more durable. Though by no means would I go out and buy one, unless you like the bigger screen.
I'm using one right now the (good thing) is fast (bad) I get bored so fast I've had an android before so now i can't customize add widgets and most important every app in the App Store you need to buy it even angry birds on android is free and the theme for the market sucks android beats it on that.