Multipage prototype Q4

I see that this is on the current roadmap. I have a use case that requires multipage and have been implementing it using the hydralit package. Before I go too much further down that road I would like to see if the core features are going to be better and if there is a convenient migration path. So my question is whether this is in experimental stage yet? (Also, how do I list methods with beta_ and experimental_ prefixes?) Do you need tire-kickers?

Fred