The use of the vernacular is something that is permitted under the Novus Ordo, but the language that the Novus Ordo is published in is Latin. The official language of the Church is Latin. The Novus Ordo is the rite followed in the majority of the Latin Rite parishes. Generally, the Novus Ordo is said in the vernacular, but this is not required under the rite.
This rite is somewhat different from the previous rite. Three more Eucharistic Prayers were added. The Liturgy of the Word was changed from an epistle, the gospel, and last gospel to an Old Testament reading (or from Acts during the Easter Season), an epistle, and the gospel. Some other prayers were removed or altered.