We have been explaining the changes in Magnificat month by month. One of the most obvious is in the greeting at Mass. The Priest says, "The Lord be with you," and we no longer respond, "And also with you," but, "And with your spirit" (which is exactly what the Latin says: "Et cum spiritu tuo"). What does it mean? As Lawrence Lew explained in the June issue of Magnificat, the expression comes from Saint Paul (cf. Ga 6: 18; Ph 4: 23; 2 Tm 4: 22), and is linked with the greeting from Ruth 2: 4. the “spirit” refers to the indwelling of the Holy Spirit, specifically here with reference to the ordained who “performs the sacrifice in the power of the Holy Spirit”. In a sense, we are praying in charity that our priest might abide in the Spirit. A prayer always needed, and never more than today when priesthood is under such attack.
For Anthony Esolen's commentary for Magnificat on the poetry of the new translation, see Zenit or First Things.