See this comparison... http://reviews.cnet.com/8301-19512_7-57510949-233/so-whats-new-comparing-the-iphone-4s-and-iphone-5/
Basically all that is changed is adding LTE, slightly taller screen to make it 16:9 instead of 3:2, and an A6 processor.
Oh yeah, and 1 more microphone, better front facing camera, thinner, lighter, taller, new proprietary connector making all existing docks, accessories, chargers etc mostly useless.
Yawn...