It appears the Canon EOS R1 is definitely in the hands of select photographers, undergoing…
Canon EF 70-200mm F/4L IS II USM lens may be announced before Photokina 2018
The Canon EF 70-200mm F/4L IS II USM lens might be announced soon, likely before Photokina 2018, according to Nokishita.
There have been rumors on other sites about an EF 70-200mm f/2.8L IS III lens. Unfortunately it turned out to be wrong.
The upcoming Canon EF 70-200mm F/4L IS II will replace the Canon EF 70-200mm F/4L IS (announced in 2003).