As part of the Summorum Pontificum conference taking place in Rome and organized by Giovani e Tradizione, Archbishop Raymond Burke, Prefect of the Apostolic Signatura, will celebrate a Solemn Pontifical Mass at the altar of the chapel of the Blessed Sacrament in St. Peter's Basilica.
Needless to say, this is a significant step for the usus antiquior.
(As an aside, speaking with friends in Rome, the conference has proven a major success. Watch for more news and photos here and elsewhere. I also believe the time of the Mass was changed from 10:00am to 9:30am so for those who might be thinking of going, do make note.)