Just read the video specs for the D600 - disappointed that is doesn't have 50/60fps.
Overall, I'm a bit puzzled about this camera; on one hand it looks like a very good camera in terms of spec, geared towards people who want a 'do-everything' tool with a high megapixel count and good detail. In that sense it seems like the 'new' D700, which is no bad thing at all.
However, with the D4 and the D3s still in the lime-up, plus a D800/800e, it's FX overkill in my mind.... me and Dean (23thirdman) both commented yesterday that it would have made sense to directly replace the D300s to give DX users something to go at. I just can't see myself going for this camera because in effect, all it has over my D7000 is a slightly bigger body, more megapixels and an FX sensor. And why they've put a mode dial on it instead of what's on the D300/D3 is something I can't fathom.
Maybe I'm being a bit dense but this isn't a camera that fills a gap IMHO...
They still might yet. Personally I'd like to see a D400 which has 7-8fps at around 20mp with better iso performance than the D300s, but with the same professional body. Would make it an even better wildlife camera, especially for birds. The DX format is almost a requirement for taking a good photo of most birds, even if you do have extremely deep pockets and can afford the £4-8k super telephoto primes. First rule of bird photography is you can never have enough reach lol. The crop factor is an absolute blessing in that environment.
The D600 is still a good idea though as a lot of people take photos of people, rather than mostly wildlife, and the FF sensors are great for giving that bit extra bokeh for portraits and macro work etc.