tag-wiki status?

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Forgive me for adding a related (duplicate?) question (http://askbot.org/question/7168) but I'm curious what the status of the Tag Wiki feature is. Last update was that it was on a dev branch that you were hoping to merge in. There's some references to it in the code but I'm not sure if it was officially merged yet or not.

While I'd love that feature, I'd like to make sure any code I'm contributing handles those references correctly. Any updates?

Update:
I should clarify... since I see it in the code, if it's supported, how is the feature currently supposed to work?