I have my doubts whether we will hear about this very soon.
The official Nikon website showed the CES Agenda and does not seem to mention the D4s. Instead, one excerpt says:
Nikon’s Industry Leading Technology at CES 2014 In addition to the full line of Nikon products on display, visitors will have the opportunity to check out interactive displays featuring the latest products, a visually stunning photography area, demonstrations of Nikon Camera connectivity and a chance to see Alexx Henry’s xxArray in action. The state-of-the-art 64 camera installation features Nikon D5200 and D5300 D-SLRs and Nikon’s wireless remote system, and will drive the next generation of 3D and 4D modelling applications. Nikon will also display the next generation of flagship D-SLR, the D4S, which is currently in development and will be announced at a later date.
"Today is the tomorrow that yesterday you spent money like there was no."