Rorate Caeli, which is taken from Bishop Richard Williamson's subscription only blog, it is only a rumour but it is fascinating. Apparently the Vatican talks with the Society of Saint Pius X have hit the buffers, so the Holy Father is going to issue a Motu Proprio, merely asking the SSPX to subscribe to the Catechism of the Catechism of the Catholic Church, the same demand being made of Anglicans wishing to join the Ordinariate.
It is a clever piece of Benedictine circumvention in his quest for unity, there is no demand that the SSPXers accept the teaching of Vatican II, whatever that means, or anything else.
I presume talks will continue, I am a little disappointed that they will not define exactly what should be believed in VII's teaching or what may be rejected but I find it fascinating that now it is the Catechism that defines what it is to be a Catholic. I suppose in a sense the Council has become irrelevant - that is fascinating in itself, isn't it?
Will that work for Eastern Christians? Probably not.