In the first comment, 'Ad Orientem' has this to say:
TAC has pretty much written off the Anglican Communion and the ABC. They are mostly Anglo-Catholic in their orientation and are far more conservative than most of the GAFCON crowd rejecting women’s ordination among other things. They really would have no reason to participate in GAFCON since they have submitted a petition to the Pope in Rome asking to be received into communion with the Holy See as a sort of uniate Anglican Rite Church analogous to the Byzantine Rite Catholics.
The last I heard was their petition is being handled by the Congregation for the Doctrine of the Faith (CDF) in Rome, and they are waiting for a reply from the Vatican. In making this petition they have of course petty much signed onto all of the dogmatic teachings of the Roman Catholic Church. They hope to retain a distinctly Anglican liturgy and a married clergy. There have been a number of rumors circulating of late that Rome might be preparing to make some sort of decision but are holding off until after the Lamberth meeting as a courtesy to the ABC. This however is strictly rumor, and the sources are not what I would call reliable.
In the second, Dr. William Tighe follows up with this bit of information:
This accords with what I have heard, too. However, since all the TAC bishops who were present at their Portsmouth Synod in England last October individually signed their names to both a copy of the *Catechism of the Catholic Church* and to a document declaring their acceptance of all that that catechism contains, and sent a delegation to Rome immediately thereafter to deliver the document to the Congregation for the Doctrine of the Faith, I see no reason for the qualification “pretty much” in “they have of course petty much signed onto all of the dogmatic teachings of the Roman Catholic Church,” as they have clearly and unequivocally done so.
There was a rumor that Rowan Williams had made a direct appeal to the pope to defer the promulgation of any “Anglican Uniate (sic) Church” until after the Lambeth Conference. I understand that Lambeth Palace issued a formal disavowal in late May that any such request had been made. Whatever the truth of this, I have heard from several well-informed (and separate) sources that the project is progressing slowly in Rome, and has the favor of the pope himself.
The comments come from a post at TitusOneNine regarding the meeting of Anglican bishops in Jerusalem that has just concluded. If you're interested in that event, Times of London correspondent Ruth Gledhill has more.
As for the Priestly Society of St. Pius X and its travails, Father Z and Rorate Caeli are doing an outstanding job keeping us up to date.