Sometimes I think these years we're living in will be the first time in history that will record via machines what has happened one or two times in the history of the Roman Church:
they will change the meaning of some key aspect of dogma and doctrine important for "staying relevant", claiming it is what it meant all along, proof being that this new use brings more faithful, enforces unity etc, while separating itself from real keepers of tradition and, at the same time, claiming it is them who left the Church.
It's clear this is happening wih Liturgy, with Mariology, with attitude toward social issues. The most notable change though, was mentioned here as expressed by Pope Benedict and Pope Francis: it's a matter of emphasis that is very important. It's not that one of them denies either the Liturgy or social activity. But it's a trend that also exists in Orthodox circles, that some people see in the asketic and sacramental life of the Church the Christian life's very heart, while others see it in charity toward the neighbor and in social work.
It's a dilemma already solved by Christ Himself of course. Both Martha and Mary are right, one serving God with activity and the other with contemplation, but Mary's got the best part. Our age and time though, with all its emphasys on "change the world" issues is very "Martha". Even in Orthodoxy we hear now and then complaints about our "marian" emphasis on "mysticism". But that emphasis is given by Christ Himself. If any hierarch, orthodox or heterodox, changes the emphasis to Martha, that is a change in Christ's teaching.