....Mamiya went their own way, unfortunately! I have an RZ67 + lenses but I think Canon want to challenge Hasselblad's 645 digital, who else is there to challenge? that Mamiya ZD is getting bad press here in the uk, took too long to come to market, they should have just made a back.
Imagine the logic & ergonomics of Canon design coupled with their sensor expertise on a sealed 645 format but with new high resolution carl zeiss lenses, who would say no?.
Canon seem to have a divide and conquer attitude providing a so many different models to appeal perfectly to their specific economic consumer market needs.
I know alot of people think canon will streamline their models, combine the the two 1 series ito 1 etc, but I think they will just establish yet another model for those that need that level of resolution & quality and all these different formats will run in paralell. As Canon have no real viable threat to their market I doubt they feel the need to simplify things and apply any economies of scale to manufacturing etc as all these lines are so profitable. Many eggs in many baskets!
An affordable digital replacement of Medium format will be a goldmine for Canon