Night-Time Maps
I have been thinking a lot about night maps in Battlefield. While this has traditionally been treated as an afterthought in Battlefield's game design, I would like to bring it to a more important role given that the technical aides available today allow battles to be waged during the full 24 hours, at least between near-peer forces.
Personally, I would like to see night maps make a return, with these technical aides included as a gameplay element. Unlike previous night maps though (afaik), I would like to see maps designed specifically for this type of mode to provide optimal gameplay conditions.
Note with this that I am not suggesting a mode wherein a lack of night vision results in complete incapability to fight. Ambient light from flares or city lights could for instance provide some illumination for non-NVD users, though some areas (e.g. indoors, tunnels, etc) would require either flashlights or NVDs to be used to fight effectively. This could also be tied to map mechanics wherein for instance it is possible to shoot out light sources or disable electricity in certain parts of the map.
Recognizing that night maps aren't something everyone is interested in though, I would have it either as a separate playlist or as a toggleable option in the settings.
Overall I think it'd provide a mode of play that would be quite unique to Battlefield as very few other games of similar style allow for night-time battles.