Watch the trailer, notice weapon fire casts dynamic lights on the faces of the soilders as well as the surrounding area, affecting the shadow.
Now, on top of that, lights from actual common light sources. Gone will be the days of Planetside with only one bit static light source and affected everything outdoor and indoor. I would guess if you remove all light sources from indoor areas, it would be quite dark. There is always a background light affecting the whole world, to simulate light reflected from pretty much everything like walls, boxes, just everything. Without that, you would end up with extremly dark places just because there is no light source close enough, would require to put a light source pretty much everywhere. The technology to actually simulate reflected light realistic is in development, but the nessesary power of a GFX would make it pretty impossible to have that AND a big open world with 1000 players fighting each other.
