Apple has strict rules on embargoed information. Its one thing if something was accidentally leaked. Such a post would be taken down with no comment. That didn't happen here. My point remains: this was intended to be released today. There may be a technical reason it hasn't been released (yet). Or it was supposed to be released and was pushed back due to 13.1.2 and someone in Apple PR forgot to extend the embargo. My guess is the technical problem.