Crytek has said that the game will be more of a choreographed sandbox, in which some levels are open world, and other levels are more linear.
Also, all of the platforms will have the same level designing, this is a distinct feature of the CryEngine 3 called LiveCreate. What this feature does is whatever is developed on the PC, is automatically scaled and ported to both the Playstation 3 and Xbox 360 versions of the game.