Crytek have released an impressive tech trailer for Crysis 3 running on the CryENGINE 3.
Documentary on Crysis 3 and Crytek
Go behind the scenes of Crysis 3 with this documentary on Crytek.
Crytek have announced the launch of a free CryENGINE SDK in August 2011. (Thanks for posting, Krallis)
CryEngine 3 - GDC 2012 Tech Trailer
The CryEngine 3 has a tech demo for GDC 2012 highlighting its capabilities.