Is the new review system officially released as production, no longer considered beta?
Regarding questions about review, should the review-beta tag no longer be used?
We'll be putting up a blog post within the next couple of weeks "announcing" the feature more broadly. That will probably represent the official transition out of the current (public) beta mode.
That said, we will still be watching behavior and feedback here on meta and expect the feature to continue to evolve a lot after that "formal" launch.