HMMMMMM, i wouldnt bee too sure about that. I think between Phase one and leaf they have pretty much cornered the market.
And as for use in a nikon body well the current lens circle diameters are just not large enough to suppourt medium format.
But that can easily be fixed with a new range of lenses.
I would be very interested in seeing if this does happen or not.
For now though for me, all my medium format will be done on film.