I hope the rumored electronic viewfinder camera is true - for a lot of landscape/nature applications, it would be absolutely perfect - assuming that the screen is good enough, but a 4-5 inch version of the present D3 screen (resolution scaled with size, so 1024x768 or so) would be great. Such LCDs already exist in the video world. The only really new technology in it would be how to get the sensor to read out full time without heating up (sensor heating has inspired some MF digital back makers to put fans in their backs, and that's without live view). Unless they do something radical, it will also have a prodigious appetite for batteries, leaving that huge sensor in live view (I'm sure it'll use some sort of reduced resolution readout, so it doesn't have to process huge images for the live view).
Also remember that this will be a SLOW focusing camera unless they rig some sort of beam-splitter for phase-detect AF. The advantage of the contrast AF for more deliberate work would be that it could effectively HAVE thousands of focusing points - put the cursor wherever you want it and it'll focus there. It may turn out to be a mostly manual focus camera (fine with me), with AF (or perhaps more accurately called semi-automatic focus - it focuses, but you decide exactly where) as an assist. I hope they come out with some tilt/shift lenses for it, because that big screen would sure make a nice ground glass for the world's first one piece all-digital view camera. Unlike phase-detect AF, contrast detect would even work on a T/S lens if they wanted it to (due to the flexible focus points). Of course the great advantage is that it could also be shot on a monopod or handheld, just like a Graflex, but unlike just about any view camera since then. What's old is new again, if Nikon manages to introduce a camera that is really a cross between a Mamiya 6 and a Graflex or Linhof (with a bit of Phase One DNA as well!)...
-Dan