The Second Vatican Council in the 60s have brought on some of the greatest changes in the Catholic Church. From allowing the use of vernacular languages (from exclusively Latin) in mass to having the priest face the congregation instead of facing the tabernacle, the changes were monumental, to say the least. If my memory serves me right, it is also the time when the requirement of wearing veils during mass in women was loosened and eventually removed.
Many of the faithfuls and even non-Catholics believe that Pope Francis would initiate great changes in the Church, the question would be what those are.
In your opinion, what problems/issues in the Vatican and the Church as a whole should the Pope prioritize?