Fr Bosco at the New Zealand Liturgy site has written a good critique of this coverage. (See: Vatican has Jesus born in Nazareth?) As he says,
[...] the Vatican is certainly not shifting Jesus’ birthplace from Bethlehem to Nazareth. It is shifting from imagery drawn primarily from St. Luke’s Gospel to this year presenting imagery drawn primarily from St. Matthew’s Gospel.As Corporal Jones would say, "Don't panic! Don't panic!"