R5 Mark III is most likely 2 years away and R5s is a camera I have been waiting for 6 years now.
I am still very happy with the original R5 and probably don't need anything more, but if they come out with higher MP count I will shell out the cash.
My wish list:
80+ Megapixels
Top spec viewfinder (9+M dots)
If possible: superfast shooting for intelligent bracketing in post (something similar to iPhone)
As a long-time user of Sony with the 9+M dots I don't find the difference to be so critical over 5.76 M dots.
I think over 80MP becomes a different type of camera (R5s), but a MK III could be close to 60MP.
Best speed and performance in general is more for the R1 or R3 class so no miracles there.
I would expect perhaps a faster sensor readout and better AF is natural.