I thought the Church resently added a fourth Mystery for the Rosary.
In October 2002, His Holiness, Pope John Paul II, recommended adding 5 more Mysteries to the Rosary to be prayed on Thursdays -- the "Luminous Mysteries" which focus on Jesus' public life. These Mysteries are:
The Baptism in the Jordan
The Marriage Feast at Cana
The Proclamation of the Kingdom
The Transfiguration
The Institution of the Eucharist
This novelty does not change the true Rosary and is merely presented as an option for Christians. This option, however, is one that totally disrupts the relationship between the Rosary and the Breviary's Psalms.