A few weeks ago we mentioned that new DO lenses were on the way, but that they would be for the RF mount and not the EF mount.
We’re now receiving more information from other places suggesting that this is going to be the case. We’re told that the “first true super telephoto lens for the RF mount will be a diffractive optics lens”.
The same source also mentioned that an RF 300mm f/2.8L IS was currently in development, but not anywhere close to becoming a consumer product.
While we weren’t told what the focal length for the first RF mount DO lens would be, we’d wager on a 500mm lens is a good place to start for the EOS R system.
We are being flooded with a lot of RF mount lens “rumors” at the moment, so there will obviously be more to come on the topic.