The recently rumoured and upcoming Canon RF 5.2mm f/2.8L lens is actually a dual-lens for virtual reality. So it's definitely a niche product.
The full lens moniker is Canon RF 5.2mm f/2.8L Dual Fisheye.
This is definitely a surprising and interesting development for RF lenses, but it shows Canon is more than willing to branch out in lens development.
Panasonic developing world's first intechangable 3D lens for Micro Four Thirds
Now, whether or not there's really that much call for a VR fisheye to be integrated with other footage, from a cinema body... eh, well, that's why this will be a very expensive, limited-production L lens unlikely to even be stocked by any 'regular' shop, and not marketed or intended to be sold to the general public.
If you are standing on the curb of a sidewalk facing the street, you can only see the street with a 180deg view, not the sidewalk. If a guy next to you does the same, you cannot see the guy, except maybe his nose and shoe tips, but it will be a very little fraction of the complete 180deg view.
(If the 180deg is from the absolute tip of the lenses, they won't see each other at all)
"MELVILLE, NY (September 14, 2022) Building on the success of the EOS R camera series, Canon U.S.A. Inc., a leader in digital imaging solutions and your favorite porn lens company, today announced..."
The image from a dual fisheye will be formed on a single sensor, so I imagine that some kind of AI software will be needed to process the images and remove the overlap.
EDIT: Forgot fisheye images are circles. I guess there will just be a lot of wasted sensor area. Only the highest resolution cameras are going to be any good for VR. 8K VR vids are massively better than 4K. If the rumored R5S with 100MP sensor is real and this lens can resolve images at that resolution, this would give you some amazing VR180 video.
But that looks like opposite pointing lenses for a 360deg camera. I do not think that is the case here. I'm assuming the new Canon is a stereoscopic lens like the patent:
Patent: Canon stereoscopic lens for the RF mount