The Canon EOS R5 is the company's highest-resolution mirrorless camera to date, but as the general 5D analog, it actually is not meant to be the company's high-resolution body. This means we will likely see a high-resolution RF mount body at some point, and it looks like Canon is aiming to clear 100 megapixels.
Canon Rumors is reporting that Canon has not yet decided which sensor they will use in their upcoming high-resolution mirrorless camera, but that their goal currently sits at 100 megapixels or more. This camera is sure to be the replacement for the 5DS and 5DS R. Despite being released in early 2015, at 50.6 megapixels, both these cameras are actually the highest-resolution bodies the company has ever released, and of course, with advancements in dynamic range, autofocus systems, and an entirely new mount, it is time for an update. Personally, I am not particularly surprised to hear that Canon is aiming for such high levels, as their premium RF lenses have shown remarkable image quality with a lot of room to grow in terms of resolution, and the company may want to leapfrog the Sony a7R IV for full frame resolution bragging rights. The 5DS and 5DS R were priced at $3,699 and $3,899, respectively, on their release, but it is not clear what price this new camera would be.