There is still no reliable information about the “interpretations” of Summorum pontificum announced by Francis, but there are numerous conjectures. Some of them are to be taken quite seriously.
Perhaps the most interesting consideration: Since there is talk of “interpretation,” the text of the motu proprio itself could remain untouched—the planned changes would be realized through a rewrite of the 2011 Universae Ecclesiae implementing regulations. Deeper interventions would thus not be necessary for the time being; yet one would have to accept certain incongruities between the Motu Proprio, which as such has the force of law, and the implementing regulations. This is precisely what one must expect in view of the increasingly demonstrated disregard for formal law and its norms in Rome.