What's changed? Not much really. Slimmer, new processor, 1GB RAM, got LTE support, longer screen, panorama shots, and a new "lightning" connector. Good luck buying more junk adapters to run your old devices for iPhone5. No NFC support yet.
Now Iphone 5 must be sued for copying everything from the 4s.
I was expecting fireworks today but really disappointed. I suppose, had Steve Jobs been there, things would've really been much more exciting.
Simply saying the new phone isn't that great.