See the feature highlights for the Unreal Engine 3 from GDC 2012.
Kite is a cinematic created in Unreal Engine 4 and features a diverse and beautifully realized 100 square mile landscape.
Unreal Paris - Virtual Tour
Explore a beautiful Parisian apartment running in real-time on the Unreal Engine 4.
Substance in Unreal Engine 4 Tutorial Series
Allegorithmic have created a tutorial series that covers how to use Substance with Unreal Engine 4.