This is an excerpt from a Sima Q&A posted by Imaging Resource:
William Brawley: I have another question: Have there been any plans to make lenses in Canon RF or the Nikon Z-mount?
Kazuto Yamaki: We are still checking their systems, and it’s a bit too early to make comment. But right now, we’re checking the compatibility between our lenses and their mount adapter. We already know that it works almost perfectly, but in some specific settings and [for some] operations, our lens does not work perfectly [with their adapter yet], like continuous burst mode…
Dave Etchells: …and some particular focus settings, or whatever.
Kazuto Yamaki: Yeah, yeah. So our software engineer is now checking all the details, and if he finds some minor issues, we’ll solve it.
Dave Etchells: Yeah, you solve it and you do a firmware update on the lens to fix that.
Kazuto Yamaki: Right. But at the same time, we are looking at their system.