I have been told that the EOS 5D series is going the way of the EOS 7D series.
There will be no direct DSLR successor for the EOS 5D Mark IV.
The source claims that the EOS 5D Mark V development was stopped “some time ago”, and that there are no plans to make an EOS R5 version of the popular professional DSLR line.
The same source adds that Canon is obviously aware of the popularity of the 5D line and the fact that there are still a lot of shooters that will prefer the DSLR experience. The source suspects that there is some kind of development going on to appease those users, but didn't know exactly what it was.
More to come…