The specifics are out. The sometimes-hard-to-please Ken Rockwell says it will completely replace the D800, and I think I agree with him - 36MP is more resolution (and more disk storage!) than you need, unless you're shooting something that will be blown up to a 20-story building wall mural. And it has AI indexing, so you can meter with your gorgeous old Nikkor AI lenses made since 1977 (or AI-converted lenses made since 1959).
Update (February): Hoping to have a longer review one of these weeks.
Reply from Jacek at 2012-09-20 06:47:57.718
Some say that high resolution is a sales pitch and that 5mp is more than enough for an average consumer. This is at least misleading.
High resolution quickly becomes valuable when you get into sports photography. At the sideline, there's no time to frame the image correctly, so you end up cropping later. Cropping is pretty much the norm for shooting sports. And to take a small part of a photo and make it a good quality desktop background, you really need to shoot at very high res.
Reply from Ian Darwin at 2013-01-04 17:04:58.391Agreed, there are many times you need more than 5 or 6 MP - the D600 will mostly replace my aging but still-going-strong D70 for this reason (among many others).