I just posted this on PhotoRumors, but I think it will be also of interest for [NR] readers how Canon will approach their full frame mirrorless solution. Here is the leaked Canon EOS R full frame mirrorless lens roadmap – the official announcement is next week (September 5th):
There will also be a new M-R adapter and an additional PD-E1 accessory.
The Nikon Z mirrorless map can be found here and here.
Source: Nokishita, Via PhotoRumors