White iPhone 4 delay due to light leaking out around the deviceThis article contains unofficial information.
Had the Cupertino based company used metal or plastic instead of glass, it could cover up the light using a simple coating. This cannot be used on glass which is a problem. Sprint has advertised its white EVO 4G phone as a potential substitute for those who really desire a white model, but this phone has also had some leakage problems along its seams, but not nearly as much as the iPhone 4 has had. The reason is that the HTC made EVO 4G uses a plastic material for the back of the phone, allowing the placement of a coating to block some of the light. Hopefully, Apple will be able to resolve this problem in time to ship some white iPhone 4 models before the end of the year.
Apple iPhone 4 Specifications | Review