You have undoubtedly already seen this on the internets but in the off chance you haven't: there is an interesting picture and set of specs on what is likely going to be the D700's successor, the D800, on nikonrumors.com. If true and not a photoshopped picture, this looks like one very interesting camera. With 36 MP it will have basically the same pixel density as the 16.2MP crop sensor D7000. This means it should be a a great compromise between noise, dynamic range, and resolution if it uses the same or better sensor technology. A fantastic DSLR camera for landscape photography in other words. I am always looking for ways to get really large prints to look good at least to me that do not involve all the stitching I do now. This is because composing the image in the field with the stitching in mind is not trivial and involves a lot of visualization. Having to visualize is not a bad thing overall of course but even Ansel had a ground glass plate to see the composition in the field. I have to approximate this with some kludgy comparisons that are not super exact (see here for an example). Also, the viewfinders on full frame cameras are so much better than on crop cameras as I am reminded of every time I put my eye to my old 35 mm film DSLR. Of course, when you use live view, as I do all the time on my D300 when doing landscape work that doesn't matter that much. It makes a huge difference in candid and other types of photography though and is therefore a very useful thing to have and a major advantage of full frame cameras over crop sensor ones.
So to Nikon I say: if you need any beta testers or reviewers, send one my way. I will test the heck out of it ;-) . Of course, when this camera would actually come out, I am sure Nikon will price it at a price point equivalent to "Canon 5D mkII + one or two nice lenses" so as to still make it unattainable to only a few. Hopefully it won't be anywhere near the stratospheric D3x range, but even that wouldn't surprise me.