What exactly is the purpose of the Environment Preview?  It cannot be scaled nor can it be rotated.  It doesn't project an environment map unless you plug the map into the Color input and retint the chip white.  It is not visible in either Raytrace or Camera.  The only place HDR rotation, location, and scaling manipulation can be performed is directly in the Material Room Background.  This can be somewhat performed already in P12 with the exception of the Diffuse IBL.  I really need a thorough explanation.