You will be on firmer ground if you base your own view of the current situation on the second part of the interview granted by the Prefect of the Congregation for the Doctrine of the Faith to NCRegister's Edward Pentin (and published yesterday). Nothing has really changed at the moment.
As for Müller's words in an interview to NDR Kultur radio (tip: pius.info), he is right when he says that the Faith itself is non-negotiable, and that, in this sense, there are no negotiations with the SSPX, and does not think there will be more [doctrinal] talks, which have already taken place - it is quite likely that the SSPX superiors would say the same thing: that is, that the Faith is non-negotiable, and that the doctrinal discussions have ended.
As eager as we are to report some kind of final conclusion to this matter, we urge you to remain patient, as we are: if there is to be either an agreement or an official rupture of contacts, the Pontifical Commission Ecclesia Dei, by way of the Holy See Press Office, and the SSPX's DICI will officially make the information public before any blog, and not by way of an interview to a radio station...
