The CMOS sensor is probably the same Sony chip used in the IQ250 and Hasselblad.
It will be fun to test the Phaseone claims that they know better than anybody else how to extract top image quality from a chip. Pentax is making the same claims in fact.
And, if it is indeed better, then to check whether it is 25,000 US$ worth better or not.
Another key aspect is the quality of the live view implementation that Phaseone seems to have executed very well.
As far as pricing goes, I would be extremely surprised if the 645DII sold for more than 10,000 US$. That is psychological barrier above which Japanese camera companies seem to think that they will not succeed with the target audience of the 645D in Japan. We will see in a few days.
Cheers,
Bernard