The design you can see above is impressive for two things.
First and foremost is the return to a horizontal camera configuration (as seen in the iPhone Plus spheres) with a flash positioned around the main camera and microphone below it. For many people, this will be a much more enjoyable way of integrating three lenses than what was speculated before.
The extra lens is expected to introduce a potentially revolutionary 3D sensor.
Second, and more subtle, the new iPhone also has a smaller, slightly slimmer frame.
It is important to note that Hemmerstoffer emphasizes that the two formats that iPhone has revealed so far are true, but they are also part of the Apple’s Validation Testing (EVT) process, which means we can see a , either or both as a final version.