I posted a spec for an updated version of the Hide function at Flow/Hide spec. I think this new version will match the current talk page functionality more closely -- hidden topics will actually be removed from the board view.
The spec includes rough wireframes, which are not mockups -- It won't actually look exactly like that, but that's the functionality change that I'd like to build.
I'm interested in hearing what you think -- especially from Gryllida, because I know you have a lot of ideas about the moderation actions. What do you think of the new ideas?