Good news for all of us with dreams of one day owning such a beasty camera system!
In ten years a camera with D3 specs will be selling at an afordable price.
In ten years only the lowest priced entry level SLRs will have DX format sensors and everyone else will be shooting with 24MP FF cameras
I also predict that we will have some kind of on-camera control that will allow our 24MP camera to shoot at 12 or 6 MP just like now we have an ISO adjustment. That way we can trade resolution of low noise to suit the shot. Asonomers have been able to do this with their camera for decades. It is not exotic tech. just depend on how you clock the charge off the CCD chip.
They can it "binning" More here http://www.ccd.com/ccd103.html
You'd need to be clever to use this with a byer mosaic filfer but I can think of a few ways to get it to work