And also with a new 645 digital lens, an ultra-wide angle zoom:
Via: Photo Rumors.
As for the sensor, it will not be a CCD one anymore. This is a good news for me, as I may be able to get an old and "useless" 645D I cheaply, to use my old 645 film glasses! :-D
Related:
I've Cropped My Pentax 645 Lenses Myself, in 1.6X! :-o