It appears the Canon EOS R1 is definitely in the hands of select photographers, undergoing…
First Image of Canon EF 100-400mm f/4.5-5.6L IS II Lens Leaked
The first image of the upcoming Canon EF 100-400mm f/4.5-5.6L IS II lens leaked at Digicame-info (translated). It definitely looks like the [shoplink 24086]EF 70-300mm f/4-5.6L[/shoplink]. Announcement is imminent.