Someone from Epic staff said - there are many amazing rendering techniques on the market, but there is always lack of time to implement them. For example Order 1886, The Last of Us and some other games use capsule shadows for dynamic objects. In UE4 they’ll come only in 4.11… On other hand, volumetric lighting has pretty large impact on level’s atmosphere, and shouldn’t be done in last week before game release. So, like topic starter said - ASAP.