We have been told that the next APS-C DSLR will shoot 4K from a 32.5mp sensor, and will do so without any sort of “meaningful” crop. So we may be getting the new generation of Canon sensors with line skipping or pixel binning for video work.
Other than that, there's nothing really new to report about the EOS 90D. You can check out the rumoured spec list for the EOS 90D here.
*update* I added pixel binning as a possibility for Canon in getting rid of the heavy crop they currently have on their ILC still cameras for 4K video.