I've been looking at all the information out there so far on the new Pentax 645Z and it looks to be damned impressive. It's a gut punch to the medium format camera industry, from a seasoned veteran of medium format photography.
Pentax was one of the kings when it came to medium format film photography. The 6x7, 67 and 67II, as well as the original 645, 645N and 645 NII. I have owned both the 645 and 645N over the years and they were excellent cameras. Pentax's medium format optics were serious contenders as well.
Its going to be very interesting to see how the industry responds when Phase One and their IQ 250 costs just short of $35,000 and the Hasselblad H5Dc starts at $27,500. All three cameras use the same sensor- The first medium format CMOS sensor, which was developed by Sony.
The coolest thing about this new Pentax camera is that it will use any Pentax 645 mount lens going all the way back to the original 645 manual focus lenses. I have yet to see confirmation but that would also mean that their 6x7 lenses can be used with their adapter.
Looks like a win to me.