The images of the cases of upcoming new iPhone 4 line up (iPhone 4S) have been leaked by a BGR source, which has started appearing at the AT&T corporate stores around the world. The larger opening for the rear camera in the images indicates that it may address the issues with LED flash performance in iPhone 4S.
The below image clearly shows the difference when the case of iPhone 4 and iPhone 4S are kept side by side.
Chronicwire has also posted the images of the case box from the manufacturer Otterbox, whom have already produced 3,000,000 cases for iPhone 4S. Though the leaked photo shows that iPhone 4S will carry the volume buttons on the right-hand-side of the device above the SIM-card slot rather than on the left-hand-side as in the iPhone 4 but the earlier leaked parts does not indicate such a change in the new upcoming device.
Earlier, there are reports that Apple will be launching the cheaper iPhone 4 next month with better camera and upgraded A5 processor but majorly the design will remain the same as iPhone 4 models.