I spent a couple of years with a 7DII, then a few months with the 5DIV followed by a few more with the R. Based on that experience, I hope that at least one of the upcoming R models has an improved AF system for sports and birds (perhaps using some of the deep learning technology developed for the 1DMIII). I would also like to have the new Smart Controller built into the AF-On button for fast control of the AF Point selection instead of the joystick. An increase to a reliable 10 fps to go along with the improved AF would be very welcome, and if having an essentially unlimited buffer at the higher frame rate requires a switch from SD to CFExpress (1 card or 2), so be it. I would rather have more dynamic range than more resolution. I would also like to be able to save 10-bit HEIF files. IBIS would be nice, but I have never tried it, so I don't know how much I would like to have it. Finally, I like the flippy screen, but would also like good weather sealing. Maybe not so reasonable to want both, but a guy can dream, can't he?