There have been mentions of a new EOS R body coming in Q4 of 2019 or Q1 of 2020. The new body has been rumored to be the high megapixel body, and not an EOS-1D X style mirrorless camera.
We're now being told that no new EOS R body will begin shipping in 2019, and it will fall into early 2020. There is still an off chance that an announcement could come in late 2019, but we think Canon will hold off until the CP+ show next February.
I don't think this should come as much of a surprise, as Canon needs to get those 6 new RF lenses to market before another EOS R series body hits the marketplace.
The same source said that a “higher-end” DSLR will be coming in 2019, but they didn't know for sure what it would be, as Canon is keeping everything quite close to its chest.