For me?
No IBIS, no video, no GPS, no wi fi, no cuddly toy, no fondue set etc etc....
I want fast and accurate servo AF, top notch AF tracking and a viewfinder that instantly (I mean instantly) adjust to differing lighting conditions - just like an OVF. I would also like a decent frame rate (in real world use) and 3 cell batteries rather then the two cell batteries currently used - as they drive big lenses better.
Had a play with the new "R" on Monday - very nice camera indeed. Unfortunately, for my needs, it was just not the camera for me.
ML are getting there - but they have quite a way to go for my uses. Were I a Portrait/Landscape photographer (?) then I would be very interested.