Canon's RF lens library has been steadily growing, with a wide variety of standard lenses and more extreme options for a range of photographers' needs. Nonetheless, there are still a few lenses that professionals are looking for, and thankfully, another one will likely be on its way soon, with some major improvements in tow.
Canon Rumors is reporting that Canon is readying the RF 300mm f/2.8L IS USM for release soon, with prototypes of the lens out for testing as we speak. What's particularly interesting is that the new version is about a third lighter and shorter than its EF predecessor, which is always good news for any sports or wildlife photographer who has to carry large supertelephoto prime lenses around. As the second longest lens in the company's lineup with an f/2.8 aperture, it has been quite popular among people like bird photographers, who need a lot of reach in tandem with a wide maximum aperture that allows them to keep their shutter speeds fast. No doubt, an RF version of the lens would be highly popular. There is not an exact timeline for the lens yet, but it looks as if Canon is aiming for the first half of 2023. I believe that with the EOS R1 also expected sometime next year, Canon is placing high priority on their supertelephoto prime lenses at the moment. We'll see what next year brings!