Crytek's CryEngine has joined the list of dev tools available for the NGP, among many other notable middleware solutions like the Unreal Engine, as well as the Havok and NaturalMotion physics engines.
Sony Computer Entertainment put out the list via press release (updated as of January 27). Here is the list of tools currently available for developing on the NGP:
Blitz Games' BlitzTech
Epic Games' Unreal Engine
Terminal Reality's Infernal Engine
Vicious Cycle's Vicious Engine
RAD Game Tools