Indeed those aren’t available yet.
The plug-ins that add those live for now on my machine as I develop them for my RhinoCycles integration work - I use them to interactively work on shaders and to see interaction of changes to shader definitions as I go.
Currently Rhino WIP has pretty good converted shaders (rhino -> cycles), except for reflection. Doing it the old method takes way too much time. These plug-ins help me iterate in a much improved cycle.
The old way of doing shaders entailed: trying to understand how Rhino Render renders a specific material, say plastic, recreate that in Blender, tweak until it looks in Blender Cycles similar to that in Rhino Render. Then look at the nodes and write that manually as C#. Compile RhinoCycles, start Rhino, load a test scene, switch to Raytraced mode. So, Grasshopper helps me a lot. When I am done with those conversions and the integration of Cycles in Rhino is in the very least awesome (it is getting close, but I can still improve…) I think we’re ready to also get those shader components to the public. So, until then I’ll let you enjoy the potential through videos and through the shader conversions I am working on