As both a D7000 and D700 owner, the decision is slightly blurred by the need for a new semi pro APS-C sensor D400 style camera. If I could be convinced totally that the D800 could deliver my wildlife needs in DX mode to a better IQ in terms of ISO noise than my D7000, then I am interested. There again I am also keen on landscape and I'm afraid to say that to see the best results of what a D800 can do is not always going to be available by viewing the images here. Many images I see from the D800 could in my view have been achieved by a D700, even many of the "wow" factor results.
The D800 is an expensive upgrade if it will do little more than my D7000 and D700. However, I do take Eric's point when he says - "But to me, the question is what's next? Do you intend to keep using the D700 until the successor to the D800 is released around 2015? Are you looking for a D400 to compliment a D700? Are you looking to add mirrorless capability?"
In financial terms, I suppose my 3.5 year old D700 or near 2 year old D7000 could catastrophically fail rendering the camera useless and valueless too. To buy a D800 for that reason alone is expensive as I would probably be purchasing just the satisfaction of a warranty!
It's a difficult call and one I am constantly fighting with, not helped with the AF issues which I am sure are now resolved on all new builds. My final decision will be made no later than 23rd September this year when Photokina will either announce a new semi pro APS-C sensor dSLR or not.
Personally, all I know is that from a landscape perspective if a D800 had never been launched I would not be wishing a replacement for a D700, so for landscape photography I feel I have answered my own question