As you can see in the photos, one of the noticeable changes would be how the flash has been repositioned from the side of the camera lens to sitting below it. Also what’s interesting is the fact that the lens cutout seems to be larger than that of the previous iPhone. Of course it’s hard to tell how much larger or maybe it’s the same and it’s merely a perspective issue, but from the photos alone it does look to be a bit bigger.
An interesting addition to the design would be the four speaker grills placed at the top and bottom of the phone. While the four speaker setup can be found on the iPad Pro tablets, there was never any mention of a similar setup coming to the iPhone 7. At most what we heard was the removal of the headphone jack (which is missing from the prototype) would allow Apple to add another speaker.
In any case overall the design is similar to what we’ve seen so far save for some slight changes which may or may not be fake, but it’s still a good idea to take it with a grain of salt for now.