8K in smaller camera bodies will give you hot stuff - literally. You will need to take ice packs with you to cool your camera frequently when shooting video.With the Olympics coming up in 2020, are we going to start seeing Canon 8K components and lenses? I think that all the major Camera manufacturers have committed to 8K for the Olympics.
Its possible that the 8K cameras will still be more prototype than production, but there seems to be a lot of silence about Canon 8K products. Canon lenses are usually used for broadcast at the Olympics, even on Sony cameras, so it seems that its time for 8K lenses to start appearing or at least development announcements.