Here is a little rumour in that ZEISS wants to update their OTUS series of 28 mm, 55 mm, 85 mm and 105 mm manual focus and manual iris lenses with RF mount at those same focus lengths BUT will be adding a 14mm and a 135 mm focal length set of lenses to the lineup for the RF mount! Since there is no motor control (i.e. the OTUS lenses are fully manual!), ZEISS won't be having an Intellectual Property issue since Canon cannot patent the mount specifics themselves -- just the electronic control systems and internal optics design!
If that were to happen, for my PERSONAL camera and lens collection, I would Loooooooove to have a full set of ZEISS Otus fully manual lenses since I have been shooting pretty much fully manual for most of my professional video and still-photo imaging life (35+ years now!). Otus lenses are sooooooo SHARP and CRISP that the images are almost surreal in their quality and at f/1.4, they are GREAT for Astrophotography!
They are big and very expensive lenses BUT their heavy-duty weight and quality construction plus fully-manual-nature actually HELP your still/video shooting!
I wouldn't be surprised to see such an update from ZEISS by early next year!
V