So I will said my predictions here based on what I like
An unibody constructed all-metal, 16in MacBook Pro. With USB-C, SDXC and ThunderBolt stuffs. The thickness down to 13.5-16mm straight forward (which I don't know it's going to be enough for a USB-3, so if it's going to be thinner, USB-3 might be vanished in the MacBooks. We will hear something like "they are not ambidextrous, slow and HUGE", although I agree. Also it means we gotta buy adapters for old flash drives now lol.)
Larger Trackpad with enhanced Force Touch (like 3D Touch this year), possibly a keyboard with bigger keys but not necessarily the butterfly. speakers still on the sides, if they add one on the top but..I don't think so.
It comes three or four color includes gold, silver, and space gray. No more glowing Apple logo on the back (due to screen thickness down and it's awkward to have a gold case with a white light..).