According to the pictures, the screen of the upcoming iPhone 5 has an edge-to edge screen while the flash has been moved to the upper right corner, away from the lens. International trading site Alibaba.com, the source of some accurate leaks regarding Apple products in the past, has a listing for a "Newest design crystal case for Apple iPhone 5g(sic)" from Guangdong, China-based Kulcase.
Before Apple introduced the iPad 2, cases were leaked as far back as December that accurately matched the specifications of the tablet. Case manufacturers also had listings for the Verizon branded Apple iPhone 4 days before the device was introduced. Case manufacturers obviously need to know the size and specs of a device before mass producing their wares and are a good source of leaks.
source: Alibaba, Apple.pro via AppleInsider