Battlefield 4: Night Operations has a new cinematic trailer, but even so, there is no release date. The trailer gives you some ideas about how will look the new map, Zavod: Graveyard Shift, and how is going to be playing on it.
Although there is no certain release date, we do know that it will be available for free. The new map is actually a night version of Zavod 311. Also, the map supports the following game modes: Conquest, Rush, Obliteration, and also the infantry focused game modes Team Death Match, Domination and Gun Master.