It’s mirrorless. It’s full frame. It has a new mount, of course. The RF mount is Canon’s latest, and its engineers have created a versatile design with a 20mm flange distance and 54mm inner diameter, both of which will lead to more advanced optics and some brilliant new lenses.
If I were still living the Canon life, this would be a great upgrade from something like the 70D that I used to carry, but I’m really happy with my Sony a7R II. Sony is simply killing it in this space, and even with the EOS R, Canon has some catching up to do.