God rays, volumetric light, visor reflections / water drops, lens flares, depth of field, night & thermal vision scopes, dynamic wet surfaces with reflections, rainbows and many other effects.
Another short NV scopes preview video. This time in action, and with alternative (larger) scope textures. First you see a scope without night vision, then with the default green residual light amplifier.
Especially you can see the heavy light amplification effect of the adaptive night vision engine - without, the night's nearly pitch black, but with it, you see the boars pretty well.