Ring constraints on a single FactType verbalization in the May 2009 CTP release (changeset 1386).
I try to fix bugs as soon as I find out about them. For features, I like not having an official list because it lets me get unbiased feedback from the community, which helps us with prioritization.
In this case, I needed the spec from Terry, and it took me about 4 days to add support to the verbalization generation patterns to support all of the new constructs used only with rings.
-Matt