112 grams (20 percent lighter than 4s), 7.6 mm (18 percent thinner), 4-inch display (up from 3.5 inches), 1136×640 pixel resolution (up from 960×640), a fifth row of icons on the screen, 44 percent more color saturation, LTE network compatible, available on Verizon/Sprint/ATT, processor and graphics are 2x faster (new A6 chip).
Battery: will “exceed battery life of the iPhone 4s.” 8 hours talk time, 8 hours browsing, 10 hours wifi browsing, 10 hours video, 40 hours music, 225 hours standby.
Camera: 8 mp, 3264×2448 resolution, f/2.4 aperture, 25% smaller, improved low-light quality, panorama feature, 1080p HD video, front-facing Facetime camera updated (720p) and face detection, improved mics and speakers,
Dock and connector:
New connector is called Lightning, 8 pin, reversible (adaptor available for current connector).