From Vatican News:
On Thursday 5 December, Cardinal Giuseppe Bertello and Bishop Fernardo Vérgez Alzaga, respectively President and Secretary General of the Governorate of Vatican City State, will inaugurate the Nativity scene and the illumination of the Christmas tree set up in Saint Peter’s Square.
The crib comes from comes from Scurelle in the province of Trento, while the 26 meter high spruce tree comes from Rotzo in the province of Vicenza, Italy. The Nativity Scene, which has been made in the Trentino tradition, is said to contain 20 life-sized figures.