Billy Joel postpones concert to make way for "special appearance"
Pontiff will address General Assembly, have informal meeting with staff
Pontiff also expected to visit the White House.
Pope Francis' plans to canonize "Apostle of California" is long overdue honor, says Msgr. Weber.
Secretary of State gives hints to possible itinerary.
Leader of Philadelphia Church discusses plans for World Meeting of Families, to be attended by Pope Francis.
Prelate says Texas is a natural stop for a "bridge-building Pope."
Pontiff says he will be at World Meeting of Families in 2015.