As I've said in my posts on this forum I am disappointed that a D300s successor has not manifested itself yet. As said elsewhere I am afraid of the DX future as the high pixels D800 now offers large files in DX mode. DX owners would win as they can retain their lenses and take advantage of FX lenses too. It would be like two cameras in one.
Trouble is there are inevitable caviats. Large file sizes = lower fps in FX, reasonable fps in DX (6fps)
For wildlife photographers like myself and a person who also enjoys landscape work, this one size fits all mentality would not suit me. It's a bit like (until it's proved otherwise)trying to fit a quart into a pint pot in my view. My D700 will retain the "landscape" crown and I'll be surprised if a D600 will be a worthy contender to make me upgrade. I have seen very few bird images and those I have seen in DX mode I suspect were at quite close quarters. That said I have seen one excellent result, but suspect light conditions were excellent. I still await more than a few DX, high ISO, distant shot cropped to a reasonable i.e. not a silly crop.
Wildlife photographers are in a photographic minority and Nikon aint going to bow down to us. I have, like others, looked at what "C" can offer and frankly not a lot in my view. The equivilent long lenses (excepting the excellent low end 100-400mm) tend to be more expensive and the only APS-C sensor camera at present anywhere near suitable is the 7D. That, in all the reports I've read, is outdone by the D7000 alone.
So guys, I guess for us it's a waiting game. Have I a prediction of when? Yep 2013 if at all, I think 2012 has seen enough new models to get our heads around. I really want to be proved wrong, but 2012 is disappointing for me and many others thus far.