Great post and the mock up is a nice touch, although I think the chin won't be that thin (though I'd like to be wrong and wish it could be that thin!)
And I know there are folks who aren't looking forward to an all USB-C but I'm all in.
Also, don't forget we'll almost definitely get a 2TB SSD upgrade following in the footsteps of the new MBP, and I'm thrilled about this!
Looking forward to a Magic Touchbar Keyboard as well and it's more than likely we'll see a space gray color option.
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The iMac G4 and Surface Studio have the right idea. Build the computer into the stand in an elegant way and make the display as thin as you want for sleek appeal.
I disagree with design choice of placing the guts of the machine on the base as far as it pertains to the iMac. Don't get me wrong, for the surface studio it's perfect because the display designed to tip into a touch mode angle, but since Apple doesn't seem to be going into that direction, I see little appeal of showing a thick slab at the stand, and I think such a sight would also disgust Apple as well. For the purposes of macOS and it's completely exclusive point and click UI, it makes all the sense in the word to keep that thickness, or bulge, or what have you, hidden from sight from the user.