Parallax is enabled in the ShaderTypeMaterial -> and Skyrim supports 3 different Parallax Materials -> Normal Parallax -> Parallax Occlusion and Multi-Layer Parallax.
I decoded all of the available Materials and the latest nif.xml includes these.
Skyrim has Parallax Occlusion? That can produce great results... http://img11.abload.de/img/1n93h.jpg
That picture actually has just flat textures, but it looks like real stones.
I wonder what kind of textures use parallax occlusion mapping in Skyrim, because well, pretty much all textures look flat and ugly.