You can now see visual representations
            of mental ray for Maya shading nodes in swatch form in Maya. For
            example, you can now view mental ray for Maya custom shaders, when
            the appropriate renderer (mental ray for Maya renderer) is selected. 
         
         Note
               
                  - In mental ray for Maya, swatch rendering
                     is supported for: material shaders, procedural texture shaders,
                     sample compositing shaders, and data conversion shaders. 
                  
- For interactivity, mental ray shader
                     swatches are rendered in low rendering quality.
                  
- To maintain maximum performance when
                     IPR is running, swatches in Hypershade are
                     not updated.