See the Unreal 4 engine in action in this trailer for Primal Carnage Genesis.
Kite - Behind the Scenes
See how Epic Games created their impressive Kite tech demo for their Unreal Engine 4.
Dynamic Lighting Gameplay with UE4 and Enlighten using Blueprints
Geomerics have posted a detailed article on how they used Unreal Engine together with Enlighten.
Substance in Unreal Engine 4 Tutorial Series
Allegorithmic have created a tutorial series that covers how to use Substance with Unreal Engine 4.