Afraid not. All they are is basic landscape meshes (That may not even be complete) with the LOD distant land textures so that you can see them from the top of....say, High Horothgar and not just be looking at a flat landscape beyond Skyrim's borders.
Considering the size, it would take them as long to make the DLC as it did to make Skyrim itself. So there won't be DLC that adds them.