The only scenario I can see this working is if Nikon is ignoring the other MF players altogether and taking aim at Canon's top end customer base of wealthy hobbyists.
The notion that there are legions of pros snapping up vast quantities of high end gear is false. Nikon is not unaware of the many converts from Canon to the D800 because of the additional resolution and the predilection to pixel peeping.
But in the end it would seem that Nikon lacks the resources to assemble a system that even matches Leica's S system much less Hasselblad and Mamiya/ Phase.
OTOH maybe this is a front for Sony' s purchase of Nikon.