I love my R8. I also envy retro design. For me the R8ii should have the following things:
33mp sensor same as R6iii
Longer battery life
Up/down (not to the side!) tilt screen
IBIS
High res, big, clear EVF
Included thumb and hand grip (removable?) to facilitate handling when needed (i.e. so regular RF lenses can still be used without buying 3rd party grips)
Metal body & gorgeous, design - make Nikon ZF / Olympus OM3 jealous!
Exp triangle dials (aperture on lens)
This should be a camera for photography - if video is included keep it basic
Detachable matching lenses made of metal with clicky aperture dials
- 28mm f2.8 pancake with distance scale for zone focus and manual override
- 43mm or thereabouts f1.4 (obviously bigger!) without focus issues of recent 45mm 1.2
All above ip53 weather sealed
Personally not fussed about 2 card slots, never needed more than one!
Keep it small! (Compared to chunky bloaters R5 / R6)