Video about Avatar and new Snowdrop.
They added a new volumetric system for cloud. They have realtime GI and raytraced reflection and changing time of day and weather.
EDIT: They are very proud of raytracing and vegetation.
Big LOD system improvement mesh/primitive shading? And it was needed because you can fly using the banshee.
From what the technical director told out of quality settings no big difference of raytracing. Currently console will have realtime GI and raytraced reflection for example. But development is not finished maybe it will change.
EDIT: They confirm this is game footage and quality on PC.
They have a new procedural placement system for vegetation.
They have a new AI system for NPC and animal who reacted differently depending of the weather for example.
For SSD they are very happy and it helps the game design. There is only one loading when you load the game or load a save after everything is seamless from the ground to flying with a banshee or interior/exterior sequence.
All visibility testing/culling is done on the GPU. Another GPU driven title?