The CryEngine 3 has a tech demo for GDC 2012 highlighting its capabilities.
CRYENGINE Tech Showcase Trailer
This new tech showcase trailer offers a look at the features available with Cryengine.
CryEngine - Showcase Trailer
Crytek have released a trailer to showcase their CryEngine technology.
Nurulize - RISE Oculus DK2 Tech Demo
Nurulize are showcasing their RISE Oculus DK2 tech demo at GDC 2015 in San Francisco this week.