I think 30mp is perfect for the type of settings this camera is targeting: mainly, events and reportage. Basically a crazy sharp image with a tiny bit of room to crop (the latter of which you don’t really get much of with the R3’s 20mp), but not so big that the file size paired with the insane volume would bog the post process down too bad.
Speaking of volume — I hope they implement a way to choose selects in-camera so that you can quickly delete the throwaways. If you shoot a 3-second burst at 120fps, for example, and I want 3 out of 360, it would be very nice to save the selects and easily discard those other pics so that a) your cards don’t needlessly fill up and b) you don’t chew through your computer’s storage when importing.