My guess is that it will look more like Pope Francis than the doctrinal watchdogs, since "mystery" in the NT comes from either a root verb meaning "to close or shut the mouth" (muō) or form another meaning "to be initiated into mysteries" (mueō). In both cases it seems to mean participating in what cannot be said. So Gregory of Nyssa, after contributing so much to the development of doctrine, could still say that whenever we speak about God, we are liars. The point, I think, is that the fundamental spirit experience of life in Christ is first and foremost a passive act of being grasped by a reality that cannot be enunciated, even though it has immediately to be communicated if we are to have any gospel at all. It is a consciousness of an experience that in its directness arrests the usual progression into insight and judgment (doctrine), only then to be said in whatever language is available. Francis' directness with people seems more "mystical" than any insistence on being right.