Here are the rears to compare...
For me the rear is not displaying as evident changes as the front, the more we see rear shots. But does it look to you as well that the rear bumper of the left/right side extended higher up in the old prototype while on the new release candidate the sheet metal is extending lower? Perhaps just the angle of the cars.
From some of the shots I could also believe that the outboard parts of the rear lights could also lift up with the trunk, but I agree that in the white shot, the old shape would seem the probable one. Trouble lining components up seems more likely in some cases.
Also perhaps the shape of the charge port door seems to have changed, though, on its bottom right corner?
But yeah, while there are chances of subtle changes and even bigger changes inside that are not seen, the trunk is mostly as we know it externally. Whether or not they have managed to expand the interior of the opening remains to be seen.
New:
Old:
And earlier shorts from side:
New:
Old: