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 Engine 4 2015 Features Trailer
Take a look at the features, tools and resources available with 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.