Hi @vancej,
As recently announced on the Enhanced Rubrics: Progress and Looking Ahead - Instructure Community - 628143 blog post, student self-assessment appears to be scheduled for beta-environment release in January. The beta environment is a special Canvas instance which has new features for testing, but will get basically erased every month with a copy of things from your regular Canvas, so it's not suited for students at all (and usually not even teachers). Things are usually in beta for at least a month before getting to regular/production Canvas, so I think the soonest you'd see this is February, but it could also be much later than that depending on the testing that happens in beta.
I hope this helps a bit!
-Chris
