The sensor is slightly different in size than the M50, so it is probably a new design. That increases the possibility of DPAF. Likewise, Digic 8 on a DSLR could mean it has the horsepower to process more than a 1 to 1 crop of the video. Of course this is all speculation and we will have to wait for the real specs.Easy to figure out considering the feature set of an M50 or EOS RP, they are not going to give out better features at this price range.
I guess they can make a camera with the same hardware same 4k crop, but enabling DPAF, like M5 Mark II or 90D