Thanks to the very hard work of Maciej and Ezio, the final change required of bpo is in! That should be the last blocker for the migration. (https://github.com/python/peps/blob/master/pep-0512.txt#L698 as always is the "official" todo list.)

If there is any critical blocker that people feel must be in before the migration, speak up now! There will be a separate email about my current thinking on how to handle the migration.