Canon is expected to announce a high end, full frame mirrorless camera 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 but they may also just make a development announcement and wait till Q1, 2019 to officially bring out their high end, full frame mirrorless body.
The EOS-90D and EOS-7D Mark III cameras may be announced in Q1 of 2019. In addition, a couple of Super Telephoto and one EF-M 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 the following : EF 400mm f/2.8L IS II and EF 600mm f/4L IS II. The EF 500mm f/4L IS II and EF 300mm f/2.8L IS II replacement will probably come in 2019. 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.
The mirrorless lens expected is probably the EF-M 32mm f/1.4 STM and will give the mirrorless line a fast lens for extra flexibility in different types of photography.