Hi!
we are really happy to announce that the new AdvancedSearch interface got deployed as a beta feature to all wikis just now. [1]
This is awesome! Now, since we are now indexing categories only for select wikis - the list is here: https://noc.wikimedia.org/conf/dblists/categories-rdf.dblist - we may consider adding more wikis to it. E.g. see: https://phabricator.wikimedia.org/T194139
So which wikis need to be added?