Based on the trend and speculation of additional R camera, there should be one that sits above the 5D.I'll have to wait until the R is better than the 5D4 for servo AF. There are no customized AF cases to choose from, the servo AF doesn't track as well and it switches points in a fiddly way, the battery life is worse, and there is no GPS. I was taking pictures of a lego pinewood derby and I got about 350 shots with 10% battery remaining on the R. I would easily get twice the shots with the 5D4, and it was hard to keep the AF point on the cars because of the lag in the viewfinder. I also tend to use GPS while visiting national parks (avoid needing to take pictures of signs periodically for location cues) and still manage to get 700+ shots with GPS on with the 5D4.
Don't get me wrong, the R is a nice camera but the 5D4 is still more versatile. The R does win on off-center one-shot AF (especially useful for portraits), AF point coverage and the tremendous RF lenses. I'd love to switch out the f/2.8 holy trinity for the RF versions, but as long as I have the 5D4, I'll stay with the EF versions. I'm just waiting for 5D4 killer (hopefully the R pro will be it!).
The EOS R line is designed to cover both FF and crop FOV, as demonstrated by the R and RP, which sits above and below 6D, respectively. Additionally, the R sits right below the 5D and the next one ppl have been speculating will likely sits above 5D and below the 1D. Meaning that it will likely have a 35MP+ FF @ 6fps and 25MP+ crop @ 10-12fps. Price? $3500 to be competitive and protect their 5D IV.