Aoktar, the developer of the Octane plugin, said the nodal interface is not part of the R20 SDK. I hope he is just mistaken. That would put a serious damper on my R20 enthusiasm.
Fingers crossed!
Of course, I'm just talking about the UI itself. If the devs have access to the nodal material UI the same way they have access to the xpresso UI? I would love to use the new interface in Redshift.