While I would prefer 30-32 mp, 28 is a significant improvement and not a deal breaker for me. I'm skeptical of the 30 fps, unless that is a live-view number. A few extra fps would be welcome. A bit surprised by IBIS. If it is included, that means Canon has satisfied themselves that it is rugged and reliable or they would not put it into a 1 series body.
I will be mostly watching to see what autofocus improvements they have made. In my ideal world, I could use a single point to quickly lock on a player and stay locked on that player regardless of what comes between and regardless of where that player moves in the viewfinder. I don't expect that to happen, but getting closer would be nice.
Sounds like Canon will retain the fixed screen. Okay with me. We will see if they can improve the "silent" shutter and dust magnet sensor.