Nikon has done this before, they just shove a camera out the door to keep people talking about Nikon, as was the D4. The D4s is really what the D4 should have been.
You mean like the D4 is what the D3s should have been? And the same way the D3s was what the D3 should have been? Not to mention how much the D3 was what the D2Hs should have been ... And so on, and on, and on
Nikon has for a very long time updated their pro cameras at roughly two year intervals, alternating between upping the model number and just adding a 's'. The D4s is just the latest step in a long and fairly logical way of evolving their top press/sports cameras.
The main target audience for these cameras - that is the audience they are designed for - is full time press and sport photographers. Such photographers tend to upgrade their gear on roughly two, three or four year intervals because by then they are used up (the cameras, not the users

). And Nikon, just as Canon, makes sure that there are as new models as possible available whenever someone want to replace a worn out camera. Sure they could wait longer between upgrades to make them look more exciting, but that is not in the interests of the main audience, so they keep making smaller and incremental upgrades more often instead.
You seem to be looking at this from an angle of "don't release a new model unless there are differences enough compelling to upgrade from the previous version". That is not how the majority of the target audiences for cameras like D4 or 1D operate. They replace their cameras when they are worn out, and when they do that, they want to have the latest version of it.
The D4s, should have been much more that it is for the price tag.
The same could be said for D4, D3s, D3, D2H, D1H, D1, and for 1D X, 1D Mk4, 1D Mk3, 1D Mk2 and so on. Pro grade press/sports cameras are not good value for money deals unless you are a full time pro press/sports shooter. When you are, they are easily worth the money.
Nikon figured in Canon can get 6K for their camera than so can Nikon.
I would have bet my last dollar on the D4s being 24MP, so I was just as stunned as everyone.
No 'everyone' was not stunned, just people who do not stop for a moment considering (again) who this camera is actually built for. The fact that Nikon by popular request from the actual target audience instead added a s-raw mode with downsized raw files say a lot about what teh real priorities of the audience is - a very fast workflow. A good useful resolution is of course also desirable, but never, never ever on the expense of a fast workflow.
Nikon will get spanked when they are stuck with truck loads of unsold D4s cameras. There is no way anyone that has a D4 will buy a D4s, and that's what Nikon needs - they need people buying each new model as they come out.
Again, you seem to look at the D4 and D4s as they were consumer cameras, not pro tools.
What Nikon should start to worry about more than anything is every time they do this they risk people jumping ship to Canon for "perceived' better innovations.
Nikon has had 24MP for years and years, why it was implemented in the D4s is ludicrous.
Nikon have a long laundry list of features and functions raging from intelligent auto mode to 36 MP resolution for years, and they are not implemented in the D4s for one very simple reason - they are not needed, nor desired by the target audience for which the D4s was designed.
If there is any models in their respective offerings where both Canon and Nikon spend immense resources polling and interviewing actual users to gauge what they want, it is their press/sports cameras. The design and the specifications of these cameras look they way they do because that is what the users want in them. And whatever changes and improvements you see, you can rest assured it is one that has been asked for. And higher resolution is not a particularly high priority for most D4 and soon-to-be D4s users. While durability, speed (both in camera and in workflow) and fast accurate AF is much, much more important.
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I don't suffer from insanity, I enjoy every moment of it!
By the way, film is not dead.
It just smells funny