I would be surprised if Hasselblad's CMOS is not cheaper, as Hasselblad's stuff generally is a little bit cheaper than Phase One's. But then again they did mention multi-shot in the press release, and if there's only a version with multishot it can be more expensive. As far as I understand the wording in the press release it will be one version without and one version with multishot though, and anything other would seem strange.
In one scenario the price difference could be quite large; Phase One has chosen to value this back almost as much as a full-frame CCD. Maybe Hasselblad makes a different decision and price after sensor size and put it somewhere inbetween the current H5D-40 and H5D-50. Concerning feature set I think that would be the most logical thing to do, for a back without multishot. With multishot it becomes a different story.