Walter Cardinal Brandmuller has used the H word in regard to Catholics in adulterous marriages being granted Communion:
Can the Church deal with the topic of marriage in a pastoral manner that is different from the continual teaching of the Church? Can the Church at all change the teaching itself without falling herself into heresy?
It is evident that the pastoral practice of the Church cannot stand in opposition to the binding doctrine nor simply ignore it. In the same manner, an architect could perhaps build a most beautiful bridge. However, if he does not pay attention to the laws of structural engineering, he risks the collapse of his construction. In the same manner, every pastoral practice has to follow the Word of God if it does not want to fail. A change of the teaching, of the dogma, is unthinkable. Who nevertheless consciously does it, or insistently demands it, is a heretic – even if he wears the Roman Purple.
Go here to read the rest. Heretics wearing the Roman purple. If a Cardinal is using such blunt language, one can only imagine the furor and battle going on behind the scenes in preparation for the resumed Synod.