....Canon started on mirrorless a while ago with their EOS M range of compact cameras.
We don't know yet of course but I think that Canon will release additional R bodies rather than Mk versions of this first release body. These various additional bodies are almost certainly going to be higher spec with better weather proofing, higher burst rates and probably even 2 card slots. In other words an equivalent range to the 5D, 6D, 7D, 1DX etc D-SLR range but mirrorless. The current R body is just entry level.
Not sure about something equivalent to a 7D range, it being a cropped sensor. Maybe there will be a high performance M series camera, they would have to do a major body redesign for that model to attract 7D users, but I think the emphasis will be on the R series, especially if they are charging that much for RF lenses.
Not giving the camera a number designation seems a bit odd too. What would they call the next one!
Whatever mirrorless cameras Canon, or Nikon, release in the future they have to be better than what they have just released imho. How quickly that will happen is questionable. If Canon, and Nikon, have the capability to get close to something like the Sony a9, and that is a big if, I would expect that in late 2019 or 2020 before the Olympics. Before the Olympics has normally been the time when Canon and Nikon have released their top of the range speed machines, so a 1DXIII and D6 could be out in early 2020 too. Do they have the capacity to release both a fast mirrorless and DSLR around the same time.
And by then Sony will have the a9II too.
Nikon released a standard megapixel camera (24Mp) and a high resolution camera (47Mp) at the same time mirroring
their D750 and the D850 DSLR's, and Sony's a7III and a7RIII. Canon have had the middle megapixel ground with the 5D's (I-IV), and the 6D's slightly lower resolution, but closer in pixels to each other. The first EOS R seems to have 6DII features with a 5DIV sensor. Will they go to 50Mp with another FF mirrorless to match the 5DS and 5DR! And with a warmed over sensor from 2015!
They would have to offer a lot more in the rest of the camera than to just try and get away with more pixels.Then again, maybe not if the EOS R sells.
Ironically, if they had the released 30Mp
and 50Mp EOS R's at the same time they may have got away with small differences like Nikon with the Z's, but to bring a higher res camera later, if they do that, it would have to move further forward in a lot of areas imho and get closer to the third generation Sony's, which is what they should have already done.
It will be interesting to see what they do next. And what they will call it/them.