Yes, the XDR display without the expensive backlighting would be great, although I would prefer adding vertical space rather than horizontal.
I quite like this iMac concept by Philip Goolkasian that seems to have got rid of the chin by extending the screen down over that area. I love that, but it also has some other good ideas.
I can see a new iMac having some wireless charging capability, and this one allows the trackpad and keyboard to do so from the sides of the base, plus other objects such as AirPods on top. Something simpler such as just placing the keyboard or trackpad on top like everything else would be fine.
If keeping largely to the current format, I like the idea of the connectors being near bottom of the base, although that would create problems with having an iMac towards the rear of a desk, or near a wall. This would work better with a vertical leg such as available for the XDR monitor, so that the ports are further forward. Although either way would be a problem for those who wish to wall mount (do many do that?).