Hey hi ! Yes, there is a project underway. It’s in the foetus phase, but it’s definitely on the roadmap - I’d like to link you to a thread I started a while ago that I wish to update soon, on which you’re definitely invited to contribute : 2.x Rigging refresh discussion
In short there’s some thinking-ahead happening but it’s just that at this point, so we’re gathering ideas.
Right now there are no nodes but driver expressions allow linking an entire python script to the driver which is pretty powerful (if a little slow, I reckon). Nurbs has no role currently. We have access to matrices via python API, from inside a driver expression for example, as well as the rest of the API afaik (haven’t thoroughly checked if everything is accessible from there, never delved that deep).