I have 2 questions for video.
1) How much will dynamic range be improved?
2) Will rolling shutter be improved?
Canon not being as good at DR as other manufacturer's was never a deal breaker, but it'd be nice to see some improvements. I mean I'm used to it... skies are blown out, shaded areas are crushed. Who cares as long as the subject is exposed properly. I'd be welcome to some improvements though. Same with rolling shutter. Never bothered me much, but improvements would be nice.
The fact that the new processor and sensor are being touted, I'm kind of expecting some improvements, but tempering those expectations since historically those were never Canon priorities. Everything else, I'm confident they will implement really well. Like I have really high hopes for the IBIS. And the possibility of IBIS/Lens IS/EIS combo being really smooth.