Preview at WWDC likely in June, followed by September launch.
First Details on iPhone 7 Design: Flush Rear Camera, No Antenna Bands Across the Back
The first involves the rear camera, which protrudes slightly on the iPhone 6 and 6s. On the iPhone 7, the camera is said to sit flush with the rear casing, enabled by a thinner camera module. Recent rumors have indicated Apple is considering equipping the iPhone 7 Plus with a dual-lens rear camera, but the smaller iPhone 7 is expected to include a more traditional camera.
The other significant change with the body of the iPhone 7 is the removal of antenna bands across the rear, allowing for a cleaner all-metal look on the back. Antenna bands at the sides and around the top and bottom edges are said to remain, however.
Our source has been unable to confirm whether the device as a whole will be thinner than the iPhone 6 and 6s, although any thickness reductions would be expected to be slight, and many users (particularly those who use their devices without cases) will likely find the flush rear camera to be a significant improvement even if other dimensions remain the same.