Canon is expected to announce a high end, full frame mirrorless camera very soon, perhaps just before the 2018 Photokina Show since Nikon is also expected to announce their full frame mirrorless camera around the last week of August 2018.
The EOS-90D and EOS-7D Mark III cameras may be announced in Q1 of 2019. In addition, a couple of Super Telephoto lenses are also expected, perhaps around the time of the 2018 Photokina Show in September in Germany as well.
My hope is one of the Big White lenses will be the EF 600mm f/4DO BR. Canon showcased this lens in their Expo back in September 2015 in New York City. Currently, the EF 400mm f/4 DO IS II is my favorite DO lens and accompanies me on all my wildlife photography tours but sometimes I can use a bit more focal length.
However, I suspect the Super Telephoto lenses to be announced will be the Series III version of any of the following : EF 300mm f/2.8L IS II, EF 400mm f/2.8L IS II, EF 500mm f/4L IS II or EF 600mm f/4L IS II. Most likely the first two. These lenses are already Very good and any meaningful improvement will be at best marginally. A weight reduction will be most welcome. Some of the Series II lenses reduced about 1 1/2 pound weight from their predecessors.
A few Canon camera bodies have also shown up as the company filed registration papers with certification authorities in various countries.
Canon DS126721 is registered with overseas certification bodies. This is most probably a new Rebel camera with built-in WiFi and Bluetooth.
Two DSLR test cameras are code named K436 (EOS-80D Mark II or EOS-90D?) and K437 (EOS-7D Mark III?). Additional mirrorless cameras are code named K424, K433 and EC 811. All the new cameras come with the DIGIC 8 processors.
K424 will be a 30 to 40 MP full frame mirrorless camera with a brand new sensor, dual card slots and a burst rate performance close to the EOS-1D X Mark II DSLR camera. DIGIC 8+ processor will power the camera and DPAF 4K will come standard with the 4K video. Announcement is expected around the 2018 Photokina Show time frame.
K333 will also be a full frame mirrorless camera but with less features and a lower price.
EC 811 may be the EOS-M5 Mark II APS-C mirrorless camera.
Sadly, I am not convinced the upcoming high end, Canon full frame mirrorless camera will fit my needs unless it comes with the EF mount. These are early days and there is little point in further speculation. Keep checking back for the latest information and development.