Wed 24-Apr-13 12:04 AM | edited Wed 24-Apr-13 11:06 AM by nrothschild
There have not been that many 's' models. The D300s and D3s added video, which was a new evolving technology and a very critical marketing issue. The D300 and D3 were caught in a world where they pretty much became the only DLSRs that did not shoot video.
Very arguably the D700 should have had an 's' model video upgrade but it didn't, and I think that reflects the reluctance of Nikon to do those 's' model upgrades.
Prior to that you have to go back to the D2h, which was a much maligned camera that never lived up to its low noise/low sensor density claims (that camera is a complicated subject). Other than that, in recent memory...
The 39 af points is most likely a price differentiation issue. Not a good candidate for driving an 's' model unless Nikon feels they are at such a competitive disadvantage that they *have* to do it.
Just to say if you are waiting for a D600s you may well wait until the D600 successor, according to the odds. Unless you think there is something that is a major marketing hurdle that needs to be added well before the next regular update.