Special:Diff/4973814 Will there be an opportunity in other wikis (which are not A/B/early adopter) to try this by adding something like ?usesticky=1 to the url?
Topic on User talk:SGrabarczuk (WMF)
Oh sure! In January, the pilot (early adopter) wikis will get the sticky header as default, and at the same time, everyone who as opted in individually will also see the header. So if you have the Improvements working everywhere because you've used your global preferences, you will see it everywhere as if all wikis were pilots!