The johnny-on-the-spot site Rorate has two good pieces you would do well to look at.
First, there is an entry called Cardinal Castrillón: Relevant declarations to Corriere della Sera Also check Corriere.
Here is a salient point or two:
The Holy See did not know about SSPX Bp. Williamson’s interview with a Swedish TV station in which he spoke about the Holocaust.
Also… and this is HUGE…. HUGE:
Full communion will come. In our discussions, Bishop Fellay recognized the Second Vatican Council, he recognized it theologically. Only a few difficulties remain…
It is precisely about these difficulties that we must pray. We must pray that people of good will can disagree about points which are not clear and still remain in unity.
Did you expect, Your Excellency, this removal of the excommunication concerning you?
[Fellay:] I expected it since 2005,…
After that he dodges around a little, I think mostly for the hard-line followers, but his intention is clear enough.
It is the beginning of something, which had already begun with the Motu proprio [Summorum Pontificum]. I think that the Pope appreciates the work that we do.
In this development, this movement, some have held that you departed too late. Do you believe today that others, especially inside the Fraternity of Saint Pius X, may hold that you are departing too soon?
I cannot rule out everything, but, in case there are separations, they will be extremely minimal.
And more importantly:
[Fellay] Up to now, our roadmap has been to clarify first the doctrinal problems – even if it does not mean settling everything, but obtaining a sufficient clarification – or we risk doing things incompletely. Or it may end up badly.
And do you believe that, beyond Rome, your contacts will intensify?
[Fellay] It is the goal, as I explained in Rome, by saying that the situation, as we propose it, is certainly temorary, but it is pacifying, and that it will allow all souls of good will to catch up. This will thus be done gradually. And this will also depend on the reaction on the other side. But there is no a priori, the only a priori is that of Truth and of Charity.
As I have been writing repeatedly for day… people of good will ought to be able to disagree on things which are not absolutely clear and still remain in union. We need a sufficient agreement, not perfect agreement.
This is one of those situation in which we must not let the perfect be the enemy of the good!
Also, anyone truly interesting in the Truth, must be willing to sit and discuss in Charity.
I am very glad for what I have read here.