See the feature highlights for the Unreal Engine 3 from GDC 2012.
Physics-Based Simulations and Effects in Unreal Engine
Sam Dieter and Tim Hobson deconstruct simple physics-based simulations and effects available in the Learn tab of the Unreal Engine launcher.
Faceware Live and Unreal Engine 4
Faceware Live is integrated with Unreal Engine 4, allowing for easy to use real-time markerless facial motion capture.
Unreal Paris - Virtual Tour
Explore a beautiful Parisian apartment running in real-time on the Unreal Engine 4.