Investigation is still underway, but as of the end of Thursday wmf.2 is only on group0 (testwikis) and group1 (non-'pedias). See the tracking/blocker task at: https://phabricator.wikimedia.org/T163512

The issue that caused the revert is being tracked at: https://phabricator.wikimedia.org/T166345

You can track the status of the wmf.2 rollout via that tracking task above or by watching https://tools.wmflabs.org/versions/

Greg