Sony developed the 36MP sensor that graces the D800/D800E, Nikon rebadged it, but it was a sony designed sensor.
Sony have recently dropped that sensor into one of their own cameras, the A7R, which seems to have done well, not on CR of course, but they have brought the Camera to Market, it's doing well even though Sony hamstrung the thing with poor support regards available lenses etc.
Sony designed the 50MP CMOS Sensor now in the phase One IQ250, and Haselblad 50MP systems, I imagine it's no stretch of anyones imagination to think Sony will do with the 50MP sensor what they have done with the 36MP sensor, i.e., drop it into a Sony DSLR.
I believe that will be a wonderful thing to do, the Camera may or may not be successful, but it should prompt both Nikon & Canon to lift their game.
Canon have to a large degree taken the "safe" path with their Camera systems since the introduction of the 5DMK II, yes the 1Dx is a wonderful camera and system but it's not exactly cutting edge sensor science by a long shot, it's incremental adjustments to a tried & true system.
Sony at least are pushing the envelope, that's got to be good for us, the consumers.