Microstuttering is when 2 graphics cards get bogged down and can't communicate fast enough, so they will produce visual "hitching" because each card renders a frame, and the second card is trying to catch up with the first one (or maybe its vice versa) - either way, its the hitching that comes with running 2 gpus against their processing wall.
No way to tell if it will, but they claim their new technology will eliminate that.
I'm guessing its going to be anywhere between 10.5-11.5 inches, but we won't know until its out.