The front looks about like what I'd expect. That camera hole seems really big though—Apple usually prefers there to be some sort of margins around things like that so the design has room to breathe. Perhaps that's just the safe zone, especially if it includes a laser depth mapping capability or iris scanner? Maybe instead of Foxconn, this is just a draft made up by a case manufacturer as they sometimes have sources who leak dimensions.
As for the back, I'm currently looking at my iPhone 7 and I think that Apple logo is too big. Anyone else agree? I will say, however, that the Touch ID placement lines up pretty much exactly where the index finger does when holding the phone and seems natural. It just doesn't seem like a very Apple-like implementation, but I could see them adding it because perhaps the iris scanner is less secure so they use that to unlock your device, but you still use Touch ID to login to secure areas inside apps, to change settings, or to use Apple Pay. Alternatively, it could be used to unlock a phone when a user picks it up—raise to wake would turn on the rear sensor, and fingers on the back would authenticate. The main problem is cases and exact finger placement. Then they could implement some sort of 3D Touch home button, perhaps in a Touch Bar type area at the bottom of the display. Or perhaps this is Apple's back up plan in case they can't finalize the in-display Touch ID before they ramp up production this summer.
As for the dimensions, the rumors were talking about this thing having a bigger battery, which is always welcome. But I thought it would be a slight increase in thickness. I'm hesitant to think that Apple would make it this much thicker, and with thicker glass and stainless steel that would also make it heavier. If they do, maybe they really will call it an iPhone Pro! Or maybe it will be ceramic and they'll call it the iPhone Edition. I just hope that either way, they make it strong enough. As for width and height, it's unfortunate if they can't make it pretty much the same size as the 7. I hated the size of the 6 Plus and was so relieved when I went back to the 6s the next year. But I also understand Apple wanting some sort of side bezels as I think the display rolling off the side is really gimmicky and doesn't serve to better the user experience in the UI, but rather hinders it. It looks cool but isn't functional. I think it would be better if it went flush to the edge without rounding off, but it would also be a really sharp edge that is prone to chipping.
Overall I think the in-display thing is the way to go, and (I hate to say this) but if Steve were still running Apple, they'd likely wait until the technology was good enough and not incorporate a half-baked solution with the button on the rear. However, I believe they're under a lot of pressure to design something new given the similarity of the iPhone 7 design to the previous generation. They kind of lucked out with Samsung this past year, but if Samsung manages to not screw up again, then Apple will have a tougher time moving as many units. I hope they do the right thing and just delay it if they can't get the in-display Touch ID to work. Hopefully it's just a matter of moving back the usual September launch, for this newer model only, to something like November or even early December. I think they'll still sell a ton of them, and since it's likely to be priced higher, they'll still move a lot of 7s models as well.