According to a source who has provided reliable information in the past, the iPhone 7 body will appear very similar to the design used for the iPhone 6 and 6s, with two significant exceptions.
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.
I don’t mind that bump very much, until I look at it. I do however hope the thinner camera module will not compromise quality in any way. I’m also glad the antenna bands will (supposedly) go away — I still find them extremely unattractive.
I can’t say I’ll be surprised if the two iPhones turn out to have different camera modules — thus far only OIS has been the differentiating factor between the 6/6S and 6 Plus/6S Plus. I’ve been a Plus user for the past year, because I needed more battery on a daily basis, but this changed recently and I was going to go back to the 4.7″ size for the iPhone 7. I will probably reconsider if the 7 Plus has a better camera system.