The iPhone has 4 white and waiting now clearly mark its difference with the black model. Besides a greater thickness of about 0.2 mm, the iPhone features some new components. Finally, to be exact, the lens used seems more open and allows more light to enter. Another change, the proximity sensor located just above the speaker phone, seems to have changed.
It must be said that the component had raised some concerns about the first iPhone 4 models. The affect of these minor changes remain untold. We are still waiting for the disassemble of the White iPhone 4 professionals.
More word about the change will appear sooner or later for sure.