Epic Games has recently made several of their GDC tech session videos available for online streaming:
Exploring the Technology that Drives “The Human Race” - The development teams from Epic Games, The Mill and Arraiy provide an overview of the technology used in the production of “The Human Race” real-time short film. Read more here.
UE4 Animation and Physics Technical Showcase - Members of the UE4 development team showcase several of the animation and physics features coming to the engine. From new workflows for previewing to new tools for physics simulations, these new features aim to make development in UE4 easier than ever! Read more here.
Content-Driven Multipass Rendering in UE4 - With UE4 providing developers the ability to script drawing to render targets through Blueprints, this session provides an overview of prototype advanced rendering techniques. Read more here.