It will be fascinating to see as I think it will give a good indication of the line up Canon is aiming for with the RF mount. A question we can't yet answer is whether they will essentially replicate the EF line up, which has been quite stable for years now, or try something different.
The R was in many respects somewhere between a 6D and 5D. Was this because it was the first? Or is this the new direction? I think going forward that Canon might have to, rather like Nikon did with the D700/800/850, accept a smaller camera also being top level quality. Canon has traditionally kept the 5D just a bit below the 1D - often small things like the viewfinder cover being built in on the 1D and that flimsy bit of rubber for the 5D. With the size and quality advantages of mirrorless I suspect this connection between size and quality will disappear.
So we might have the R as the jack of all trades. The RP as the low price consumer body. Then maybe an RS as a higher spec, higher megapixel body aimed at landscape use. And eventually an RX for sports etc. That would make for a nice clean line up. In time one could imagine the R and RS then merging as both Nikon and Sony push ahead with combining high fps, good AF and high resolution, it might not be feasible long term for Canon to segment the market like that.
I am convinced Canon took the right approach. Top quality, wonderfully engineered 2.8 zooms covering 15-200mm, all stabilised, a couple of 1.2 primes, a 24-240 and a 24-105/4 and finally a stabilised, small, light 35/1.8. Right there that could cover like 90% of most uses. Now Canon can bring out the better bodies and start bringing out more unusual and specialist lenses while the really exotic stuff like tilt-shift lenses will remain EF mount for years.
A few other things I wonder about are:
Will there be an APS-C RF mount camera? Years ago it made sense, people upgraded gradually through the system. But nowadays I think this is fairly limited to birders using cameras like the D500 and full frame glass etc. With higher and higher resolution full frame sensors Canon might decide to really go for Ef-M as their consumer mount as it allows for really tiny cameras which matters a great deal for consumers. I think on internet boards it is vastly overstated how many people actually use both full frame and crop and want to put full frame lenses on crop cameras.
Will there be IBIS in the coming years? I would love it, like many here, for adapting lots of old lenses. But since Canon put IS in all of the 2.8 zooms I am far from sure they will go down this route just yet. Chances are they would rather we buy the new RF 24-70 rather than adapt the EF version!
In the EF mount, does anyone know if Canon actually cooperated with Zeiss for the ZE lenses and Voigtlander for their EF mount glass? I remain a bit jealous of the amazing glass that Voigtlander is putting out for Sony's FE mount and would love to have some of those options for RF. Unless Canon is planning to make a manual focus 40mm 1.2 (haha)) why not let Voigtlander produce it for RF?