I think the videos will start flooding out. I have seen (not watched) about 3 unboxing videos. Seems like Canon has pushed production models of the R5/R6 out.

Another from today. A feature I am paying attention too is the "animal eye AF." That could be a real key feature. Some very nice illustrations starting around 4:00 here:
https://www.youtube.com/watch?v=vbqtkR_yyjM