Less thermal/power is what Apple use as one of the deciding factors for a transition. The move to an Ax chip will definitely allow Apple to have thinner profile and smaller motherboard.
I'm guessing a very similar look to the Pro Display, just with a computer inside, a 4k/5k screen, more ports, and a power plug.
I'm guessing a very similar look to the Pro Display, just with a computer inside, a 4k/5k screen, more ports, and a power plug.