Much more coming as I'll be hands on with the X1D later today. But it looks like they've taken the best user interface in the business from Hasselblad's own H6D -- along with the sensor in the H6D-50c (or something very much like it) and put them in a body about the size of a Sony a7r II.
If you want to understand the X1D in two images, here's the second image which reveals what it is not:
More to come shortly!