Straight from the Vatican:
An app focused on the figure of the Pope. It will allow you to follow his events live and to set up alerts notifying you when papal events begin.
It will also give you access to all official papal-related content in a variety of formats: news and official speeches, galleries with the latest images and videos, access to his calendar, and links to other services of the Holy See.
Additionally, the app will let you see key areas of the Vatican through webcams distributed throughout St. Peter's Square that are always broadcasting images.