That is really not how it works with Canon.I'd really love to finally see a serious video shooter from Canon. Been using my 1DX2 to shoot 4k from time to time and it does really well. But it's bulky for that purpose (especially when trying to put on a Ronin M). I'd hoped for 4k/60 in the EOS R but best we got was 4k/30. But with 10 bit 422 CLog output over HDMI ... which I cant even do 4K output on my DX2. If the EOS RP hits with the same 4k specs as the EOS R, for $1500... I may well be all in purely as a video machine. being able to sling out 4k Canon video (which Sony doesn't compare... sorry) at that level into an Atomos Ninja for things like interviews and regular 24fps shooting... I'm in heaven.
The smaller (lighter), lower-end camera is a step down equally in terms of photo and video (with the same sensor size) with some different features like the flip-sceen on the 6DII over the 5DIV or optional C-Log on the latter vs 1DXII
So it is highly doubtful that we get any kind of 4k with the EOS RP (or clean HDMI, C-Log, headphone jack, etc.)
The most I was hopeful was an IPB only 4k like the M50 (slower UHS-I slot can still allow that), but even that would put it in a weird position with a better crop factor than the EOS R, so I doubt it is going to happen. Will turn out soon enough anyway.