In detail:

* https://phabricator.wikimedia.org exists as a read-only instance and it contains the tasks that were migrated from the now decommissioned fab.wmflabs.org. Registration is disabled while we fix some tasks -- details at https://www.mediawiki.org/wiki/Phabricator/Plan#Migration_plan . We will post here when the issues have been fixed.

* We have a test instance at https://phab-01.wmflabs.org/ where you can play as much as you want. This instance is for testing and experimenting only. Anything in there can disappear in a whim.

* When we open phabricator.wikimedia.org, the creation of new projects will be still disabled. Existing projects will be able to continue their work, but we are asking new projects to wait a few weeks, until we complete the Bugzilla migration. It's going to be still a bumpy road before Day 1, and we want to control the impact of these disruptions as much as possible.

* RT migration will follow. Details will be shared in advance.

* Bugzilla migration will follow. Details will be shared in advance as well, but we have a rough idea of the sequence of steps. Details available in the migration plan linked above, pasted here for convenience:

1. Earliest possible/expected date: October 06 but favoring Friday October 10 to interrupt engineering less (starting over the weekend). Bugzilla downtime expected of 1-3 days. Checklist:

2. Instructions to use Phabricator for bug reporting and project management.

3. Documentation of data and features that will not be available in Phabricator after the migration.
Phabricator test instance available with a sample of Bugzilla reports imported automatically (say 1 of each 10, about 700 reports).

4. At least one week of margin to receive community feedback and implement improvements.

5. Documentation of the migration process detailing sequence of steps and timeline expected.

6. Go-NoGo meeting with the Phabricator team (Andre, Chase, Mukunda, Quim), Erik, Rob, MarkB, and Greg.