I would like them to include IBIS so they could make their lenses smaller. It would also make Canon’s smallest lenses, the 50mm, the 16mm, and the 28mm more usable in low light. I don’t want to shoot everything at night with a shallow depth of field. If Ricoh could fit IBIS in their GR series, then Canon should be able to do it on the R8 Mark II! The battery problem can be solved with a LP-E6P but I’m not in favor of increasing the bulk and weight that much and would be happy with the LP-E17 if they can make sure it charges fast enough from USB-C.
I would also be happy if they were able to keep the costs down by re-using the existing 24MP sensor, but I have a feeling the 33MP sensor is the new norm and that canon is scheduling the death of their 24MP sensor now to take advantage of industry scaling.
Lastly I would like to see some weather sealing to make the camera safer to take out when it’s raining. Of course I’d like to see some more weather sealed, small, non-L lenses, but that’s probably the hardest to ask of these three requests!