The June 1st Unreal Engine Live Stream will focus on the long awaited Volumetric Fog feature this time around.
From an Unreal Engine Forum post by Alexander Paschall:
Daniel Wright joins the livestream once again, this time to talk about Volumetric Fog, a beautiful new rendering feature in 4.16. With Volumetric Fog, you can create incredible ambiance and mood in your environments using the new Volumetric Fog! Varying densities are supported so you can simulate clouds of dust or smoke flowing through light shafts, and any number of lights can affect the fog.
Watch the Twitch stream on the Unreal Engine Twitch channel at 2:00pm ET.