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As you may already know, Canon plans to officially announce the RF 400mm f/2.8L IS USM and RF 600mm f/4L IS USM likely later this month. These are the first of many professional super-telephoto prime lenses for the RF mount.
The EF versions of the 400mm f/2.8 and 600mm f/4 were updated in September of 2018 to bring them to version 3. Both the EF 300mm f/2.8L IS USM and EF 500mm f/4L IS were last updated in 2011.
I have been told that the RF versions of the latter lenses will come in early 2022 and that the new RF 500mm f/4L IS USM will be extremely light and much shorter than the current version. The 300mm is a bit more interesting, according to my source, Canon may actually release the RF mount version of the 300 f/2.8 as a zoom. Though there is reportedly a prime version also in development. I apologize for the confusion about the 300mm f/2.8.
As you may know by the RF lens roadmap, an RF 300mm f/2.8L IS USM isn’t listed. This is the first time that I’ve heard anything about such a lens.
More to come…