From the looks of the screenshots, the lighting in Arma 3 already looks good. I really think the new Arma is going to have some good graphics, but I think they should take into account the lighting in past video games and use it as an example. For example, STALKER Call Of Pripyat was phenomenal with the lighting, and looked almost photorealistic in some parts with a few mods installed. Lighting is one of the most important parts of video game graphics.