One thing I’d like to do with it is create a plugin to make specific categories more useful as “knowledge-bases” - so you’d have the first post of every topic as a wiki post, and all other posts would be “hidden” unless the user particularly wanted to see the conversation.
So you’d end up with something like this, but without having to make the topics read-only/closed.
It also opens up the possibility of doing topic-summary type things using plugins, like what is described in this spec: