Epic's Unreal Engine 4 Rivalry project shows what's now possible on mobile devices.
Substance in Unreal Engine 4 Tutorial Series
Allegorithmic have created a tutorial series that covers how to use Substance with Unreal Engine 4.
Primal Carnage Genesis - Trailer
See the Unreal 4 engine in action in this trailer for Primal Carnage Genesis.
Super Mario Bros - Gulf of Mexico
Jonathan Fletcher has created an incredible reimagining of the famous Mario and Luigi video-game characters.