Here's the full list of specs and features that Apple has announced:
Glass and aluminum design, just like the iPhone 4 and 4S but is 7.6mm thin, and weighs 112 grams. Apple claims the iPhone 5 is the world's thinnest smartphone. Overall, the display is slightly taller than the iPhone 4S screen. It has a 1135 X 640 pixel resolution and a 16:9 screen ratio. That ratio will make it better for watching widescreen movies.
Apple's apps like Mail, Keynote, Garage Band, etc. have been updated to fit the new screen size. But older third-party apps that haven't been updated to the new screen size will have black bars on either end. Developers will need to update their apps quickly. Touch sensors are integrated into the screen, meaning you'll get more accurate touch response. Will connect to the fastest wireless networks, including LTE.