I do not. It’s just another educated speculation about what mighty and secretive Canon might do in the future.
Rumor has it that Canon is set to announce an RF 400mm f/4 DO IS lens “some time in 2024”:
[…] Canon will once again bring a DO branded lens to the RF mount, in the form of an RF 400mm f/4 DO IS USM. The lens is coming some time in 2024, and will continue to improve on Canon’s DO lens designs.
So, next month’s rumors about the RF 400MM F/4 DO IS will likely be about not having or indeed having the DO (Diffractive Optics). Boring.
Go out snapping photos, it’s better ;-)
Oh, and if you want to learn how to navigate all those rumor sites without seeing ads and getting tracked, I have a neat tutorial for you.
Source: Canon Rumors