I don't see the first thing happening, unless in the meantime they will relase a cinema camera with this feature.
Like-wise, until an R3 has micro-HDMI, I don't see them doing major changes on the body.
It's the R1 that might be a more thorough redesign and the models afterwards may have it.
One think that I can predict though is that it will have a new processor with reduced power draw, so battery life won't be as bad as the original.
i did not purchase the EOS R5 precisely because it had a micro-HDMI port instead of the mini-HDMI port of my EOS R which i believe is slightly safer as it is larger. i also did not purchase the EOS R5 because i wanted identical twin card slots like in many video oriented Sony hybrid cameras and Panasonic hybrid cameras and some Fujifilm cameras. i believe they brought the same design decisions from the R5 to the R5C as they were reusing certain components and wanted to speed up the manufacturing process. in the end i purchased a C70 which is a proper Cinema Camera. that said, micro-HDMI really seems so be too fragile even with cable clamps for a camera that could do video