User blog comment:MisterWoodhouse/Pausing UCP migrations to resolve some critical blockers/@comment-32293731-20200907183748/@comment-1869454-20200908082605

It's not available as of yet. No solid ETA has been announced, but it sorta smells like it might turn up before October. Maybe.

This news post is simply announcing that Fandom is stopping the bleeding: no additional wikis will be migrated, for now. This means nothing for those wikis which've already undergone the move to UCP.