From AP:
Leo was picking up the papal tradition of offering a Sunday blessing at noon, but with several twists. Whereas his predecessors delivered the greeting from the studio window of the Apostolic Palace, off to the side of the piazza, Leo went to the very center of the square and the heart of the church. He also offered a novelty by singing the Regina Caeli prayer, a Latin prayer said during the Easter season that past popes would usually just recite.
He wore the simple white cassock of the papacy — not the formal red cape he wore on Thursday night — and had reverted back to wearing his silver pectoral Cross.