I have cut 1.28.0-wmf.20[0] for MediaWiki and extensions as the branch cut was blocking merges to master for developers.
The state of deployed code has not changed – all wikis are running the 1.28.0-wmf.18 branch of MediaWiki and extensions.
Plans for moving forward are still being discussed on Phabricator[1].
-- Tyler
[0]. https://phabricator.wikimedia.org/diffusion/MW/browse/wmf%252F1.28.0-wmf.20/ [1]. https://phabricator.wikimedia.org/T144644