[Update - Aug. 24, 1200 GMT: The Superior General of the Fraternity, Bishop B. Fellay, confirmed the date of the meeting on Aug. 15, adding that its purpose is "final evaluation of the doctrinal discussions between Rome and the SSPX which have occurred since October 2009," and that "no other specifics are known at this time," as reported today by the websites of the French and of the American Districts of the SSPX. This is also added here for the historical record of events.]
None of this (really, not a single point) is news to our readers - but, since we like to keep a running record of reports, this is what Vaticanist Andrea Tornielli mentions now:
Now [that is, on the Sep. 14 meeting,] the Vatican should subject to Fellay some memoranda of understanding, clarifying doctrinal points, as for the Council, on the interpretation of the continuity in the reform suggested since December 2005 by Pope Benedict XVI as the more authentic interpretation of the texts of Vatican II.
A proposal for a canonical adjustment will be submitted to the Society only if doctrinal difficulties are overcome, and that will resolve the current situation, in which the Lefebvrist community finds itself now. ...
The proposal which has been studied by the Vatican, would allow Lefebvrists the establishment of an ordinariate similar to that offered by the Pope has to Anglicans who wanted to come into communion with the Roman Catholic Church. In this way, the Fraternity would depend on the Holy See (and specifically on the Ecclesia Dei Commission) and could retain its characteristics without having to answer to the diocesan bishops.