Subject to community consultation, we are planning to make the New Filters—currently in beta on Watchlist— standard for all wikis by the end of Q4 2017-18 (end of this June). There are a few tasks we need to complete in advance of this release, which I will put into subtasks. Briefly, they are: 1) dd opt-out on Watchlist Prefs page like the one for RC page, 2) adapt the guided-tour widget with opt-out that we used for RC page 3) announce to communities.
Release and schedule: