While Canon has always made some of the world's most impressive lenses, they really kicked it into another gear when the RF mount came along. It seems they have no intention of stopping, with another impressive lens on the way soon.
While Canon has mostly filled out its "big white" lineup, as its supertelephoto prime lenses are known, the two shortest options, the 200mm f/2L and 300mm f/2.8L, are still missing. It seems we will be getting one of those soon, but with a major upgrade. Canon Rumors is reporting that in a few weeks, we will likely see the Canon RF 100-300mm f/2.8L IS USM lens. Such a lens is not unprecedented, as both Sigma and Nikon make 120-300mm f/2.8 lenses (I have the Sigma and love its versatility).
A patent emerged for such a lens a few months ago and even had a 1.4x teleconverter, which would make it a 140-420mm f/4 lens when engaged, though it is not clear if that will be included in the final version. The lens is rumored to retail for $9,499, and while that is expensive, it is in line with the Nikon's price and seems reasonable when one considers the EF 300mm f/2.8 prime retails for $6,099. Surely, such a lens would be tremendously popular among sports and wildlife photographers, who need those wide apertures to maintain fast shutter speeds but would certainly appreciate the versatility of a zoom.