According to latest rumors Canon may announce a new astrophotography Mirrorless in 2019. As far as I can remember the last Astrophotography DSLR camera from Canon was Canon 60Da and after that no Astrophotography camera announced from Canon.
Rumors suggest that next EOS R Mirrorless camera with a fullframe sensor will be dedicated to Astrophotography. A fair attempt to gain more user base for their Mirrorless divison.
The rumor is coming from anonymous sources of rumor mills, take with grain of salt.
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If this is true It would be great for us that do Milkyway images in landscapes and wide field deep sky images through a telescope or camera lens with that extra bit of Ha to show nebula’s better, as I do with my 60da but with a wider coverage of the sky, lets hope it comes.