Get Tinkering Spot
Framestore created a 30 second spot for Nintendo, where several Marios join forces to defeat Donkey Kong.
Unreal + SpeedTree
Unreal Engine and SpeedTree allow for these beautiful outdoors shots to run in realtime.
Dynamic Lighting Gameplay with UE4 and Enlighten using Blueprints
Geomerics have posted a detailed article on how they used Unreal Engine together with Enlighten.