Huh?
Shoot VR with Canon’s New RF5.2mm F2.8 L Dual Fisheye Lens - YouTube
I imagine that there are photographers/videographers out there that are very excited as they know exactly how they'd use this lens.
I am not one of those photographers. Overall, I am impressed to see Canon push the technology and their lens lineup. I've also always found it a bit curious why it seems that the R5 was pushed to 8K. But, it is needed for this lens, as, at this time, this lens will only work on the R5.
EDIT: Announcement from TDP newsfeed.