Rumours are being spread that Pope Francis is going to "change" doctrine on marriage and divorce. Others are spreading rumours that it will be contraception. Some of this noise is even coming from those who have masqueraded for years as "Catholics"; usually strident self-promoting laypersons (as they no doubt would wish to be termed).
Ed Peters has a sober article on the foolishness of trying to speculate over things that have no pastoral component. Doctrine cannot change. The Pope can no more change doctrine on these issues, then declare that a square is a circle. People who muse on such things do not understand the concept of the universal Ordinary Magisterium.