After enabling Wikidata role, if I try to create a new item, I get this:
[e81f51a2026ca5759a063a2c] /wiki/Special:NewItem Wikimedia\Rdbms\DBQueryError from line 1179 of /vagrant/mediawiki/includes/libs/rdbms/database/Database.php: A database query error has occurred. Did you forget to run your application's database schema updater after upgrading? Query: SELECT id_value FROM `wb_id_counters` WHERE id_type = 'wikibase-item' LIMIT 1 FOR UPDATE Function: Wikibase\SqlIdGenerator::generateNewId Error: 1146 Table 'wikidatawiki.wb_id_counters' doesn't exist (127.0.0.1)
So Wikidata does not seem to work out of the box.