Nikon just "announced" the future announcement of the D4s
Nikon | News | To be exhibited at 2014 International CES A next-generation flagship model offering specifications that respond more completely to the needs of professional photographers Digital SLR camera Nikon D4S
The good: they will address the autofocus system, that, as I say before, is one generation back from Canon's to say the less.
People that shot the 1DX for action normally have difficulties with the D4 autofocusing speed. Also not having a current generation autofocus force Nikon to cripple products like the D610.
The worrisome: The bit about the image quality what can be read from it? are they using the same sensor with new logic? We already know that the Df does better but Nikon needs more to continue to be an alternative to Canon.
The Funny: Why this pre-announcement are they aware that something big is coming or they know that pros are moving to Canon (autofocus) for the olympics and they want to control the migration?
For me, that I don't shoot sports for living the good part is the important one.