According to Fr. John Zuhlsdorf, two independent source have confirmed that the document clarifying questions regarding the motu proprio Summorum Pontificum is now on Pope Benedict's desk. Further, it will be issued in forma specifica.
The confirmation in forma specifica makes a confirmed act an act of the supreme authority of the Church, who is then legally its author. A lower judge can do nothing against such an act, given the principle that “the First See cannot be judged by anyone else.” (Code of Canon Law of 1983, c. 1404). It is for this reason that the mandatum of the Apostolic See or aperitio oris is indispensable when a lower judge undertakes a new review of a matter or evaluates a document (c. 1405 2). Consequently, a decree from a provincial council approved in forma communi remains a conciliar decree. whereas if it is approved in forma specfica, it becomes one of the Roman pontiff’s higher laws.