MediaWiki 1.33 is a future release of MediaWiki. Consult the RELEASE NOTES file for the full list of changes. It is being deployed on Wikimedia Foundation wikis through incremental "wmf"-branches starting 23 October 2018. The 1.33.0 stable release is expected to come out on sometime in June 2019. Download the latest snapshot or checkout the master branch in Git to follow this release.