That is really not how it works with Canon.
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.
I realize that. But video specs are more often overlooked with Canon. What the EOS R has is basic 4k with a bit stepped up output over HDMI. I dont see see 4k being eliminated altogether in 2019. So 4k at 30 should hold. Now whether it will also have 10bit c log etc is another story. That said, the inital rumored specs CR had included 4K and Clog. Nokishita simply had no video info. Bottom line, we still don't know anything for certain. I suspect CR will have more info within in the next 24 to 36 hours as the rumored release date is imminent