We already have a “Programming” category, which has seen plugin announcements before, I think that’s a reasonable place to post any future plugins, and each can have their own topic, for updates & whatnot. I’m not convinced a separate category is required (but then, it’s easy to create a category later, and move topics over, if that turns out to be a better approach).
Should make it more obvious how to announce plugins, to make the topics easier to discover.