In his talk to the cardinals the pope said this:
"Thus, in full awareness and at the beginning of his ministry in the Church of Rome that Peter bathed with his blood, the current Successor assumes as his primary commitment that of working tirelessly towards the reconstitution of the full and visible unity of all Christ's followers. This is his ambition, this is his compelling duty. He is aware that to do so, expressions of good feelings are not enough. Concrete gestures are required to penetrate souls and move consciences, encouraging everyone to that interior conversion which is the basis for all progress on the road of ecumenism. "
What do you think he means by "concrete gestures?"