The R5C still has it's place. There's so many differences between the R5ii and the R5C when it comes to video. R5C is a video first camera not a photo first hybrid. Cinema menu, built in cooling to keep form factor and guarantee no overheating, oversampled from full sensor in all modes, S&F, shutter angle, various monitoring tools, better battery life than the R5ii when both using the new LPE6P batteries. I can definitely see a R5Cii. Now all i'm reading is they are going to release a camera between the C80 and C400. To me that means they are going to make another cinema body style camera, not a mirrorless hybrid. Will it have built in ND's? Will it have a new sensor? Will it reuse an existing new sensor like that we see in the R5ii or C400/C80? Will it have all the XLR/Timecode/SDI/Full HDMI ports we look forward to? What are it's limitations? Will it have a CF Express Type B slot and SD slot or be severely nerfed with dual sd cards? Will it have built in wifi or will you need a $1000 USD battery grip to let you remotely control the camera? So many questions... Can't wait to see what it is. RCii or another level cinema camera with a bigger sensor? For a fact i can see Canon making an 8k full frame cinema camera. R5Cii or bigger box body like the C400 or maybe even the C80, either way it will come and i'm sure there will be variations and limitations to set them apart.
What makes sense from a business standpoint is a R5Cii with no built in ND's, triple base ISO, no SDI, full size HDMI, no xlr, built in cooling, no ibis and in a mirrorless style body.
For the higher end C***, i'll say it'll be a traditional box style body, slightly bigger than the C400, 8k Full Frame, built in ND's, triple base ISO, Full size HDMI, SDI, USB C monitor that can be relocated, smart extension/handle hot shoe, and pretty much everything that you won't be seeing in the R5Cii.
It's all about convenience for the shooter. R5Cii will need to be rigged out more as we've seen with the mark i. the higher end 8k full frame cinema camera (c***) will be more of a ready to shoot out of box for a production type of camera.
These are my thoughts alone, these are based on trends I've seen with previous cameras.
Another interesting thing is they will be coming out with a R3ii (After people thought that was dead)
And we'll be seeing a C70ii (People thought it was also dead)
Super35 isn't dead and has TONS of potential for high end sensors for it's size and requirements.
But again, this is just me