I think we all expect to see the new EOS R line of cameras and RF line of lenses to grow quickly. Canon has the R&D and manufacturing resources to make it happen.
We're told that two EOS R series bodies will be coming in 2019. One will be slotted below the Canon EOS R itself and will come first. The second body will be a “professional” series camera coming later in 2019. What “professional” means is unknown at this time. It could be a baby EOS-1D X Mark II built for speed and video, or it could be a high megapixel body meant for studio and landscape work. We probably won't get clarity on this until into 2019.
While we have heard that an EOS R series camera with an APS-C sensor is a possibility, this source noted that they've seen nothing to suggest one is coming in 2019, saying “We won't be getting an EOS R version of the EOS 7D Mark II”.
Canon will also be focused on DSLRs, as at least four new DSLR bodies are expected in 2019.