I have a D800 on order, but after following the Nikon forums and editing some of the raw images on my I7 equiped PC with plenty of memory and fast SSD, I'm beginning to wonder.
Besides cameras that don't focus, cameras that lockup (workaround reportedly doesn't work), batteries that overheat or explode, editing is extremely slow on the 50+ mp raw images I downloaded, no way could I edit 1500 or 3000 images in a reasonable time, I have to wait 30 sec or more for a simple edit like NR to update and let me proceed. I did workout a method that works, downsize the images to the same size as my 5D MK III, but then, they are not much better, and even with downsizing, high ISO 12800 images are noticibly noisier than my 5D MK III.
As long as buyers are paying a premium for them, I'll probably just resell mine when it arrives and get a 1D X.