The CryEngine 3 has a tech demo for GDC 2012 highlighting its capabilities.
CryENGINE 3 Crysis 3 Tech Trailer
Crytek have released an impressive tech trailer for Crysis 3 running on the CryENGINE 3.
SideFX GDC Reel
SideFX are showing how Houdini's procedural pipeline helps game developers save time and increase creativity in production.