There are already plenty of rumors about upcoming EOS R Pro bodies to be announced in late 2019 to early 2020. According to latest rumors from CR, there will be at least two EOS R Pro bodies: one is the high-resolution EOS R body, the other is sports oriented EOS R body.
The High-resolution EOS R body will replace current EOS 5DS/5DS R, it may feature with a new 63MP full frame sensor as already leaked before.
The second EOS R Pro body is sports oriented, this camera will feature with high frame rates, lower resolution and some advancements in sensor performance. This camera will not replace current EOS-1D X Mark II (1D X Mark III coming in 2020), instead, it will be a mirrorless EOS 7D body.