With my R7 disappointments, if they can deliver this as spec'd at about the same prices as the Mk I then I'm all over it, though I suspect this will come in closer to the R5c as it seems to combine some of the features. I'd be more than happy with 24MP's shooting in cropped mode.
I'd hope that, like the R3 and R7, the 30fps electronic can be adjusted to lower rates as 15fps is fine for me in most cases. We shall see.