A lot, according to Cardinal Christoph Schonborn, via CNS:
Jesuit Father Antonio Spadaro, editor of the journal La Civilta Cattolica, interviewed Cardinal Christoph Schonborn about Pope Francis’ apostolic exhortation “Amoris Laetitia” and reaction to it. The journal provided Catholic News Service with an English translation of the interview and its website — www.laciviltacattolica.it — was scheduled to post selections in English from the interview at 3 p.m. Rome time today.
Cardinal Schonborn: It is obvious that this is an act of the magisterium: It is an apostolic exhortation. It is clear that the pope is exercising here his role of pastor, of master and teacher of the faith, after having benefited from the consultation of the two synods. I have no doubt that it must be said that this is a pontifical document of great quality, an authentic teaching of sacra doctrina, which leads us back to the contemporary relevance of the Word of God… …The complexity of family situations, which goes far beyond what was customary in our Western societies even a few decades ago, has made it necessary to look in a more nuanced way at the complexity of these situations. To a greater degree than in the past, the objective situation of a person does not tell us everything about that person in relation to God and in relation to the church. This evolution compels us urgently to rethink what we meant when we spoke of objective situations of sin. And this implicitly entails a homogeneous evolution in the understanding and in the expression of the doctrine… …Cardinal Ratzinger had explained in the 1990s that we no longer speak automatically of a situation of mortal sin in the case of new marital unions. I remember asking Cardinal Ratzinger in 1994, when the Congregation for the Doctrine of the Faith had published its document about divorced and remarried persons: “Is it possible that the old praxis that was taken for granted, and that I knew before the [Second Vatican] Council, is still valid? This envisaged the possibility, in the internal forum with one’s confessor, of receiving the sacraments, provided that no scandal was given.” His reply was very clear, just like what Pope Francis affirms: There is no general norm that can cover all the particular cases. The general norm is very clear; and it is equally clear that it cannot cover all the cases exhaustively.