2011 GIRM 48. This chant is sung alternately by the choir and the people or similarly by a cantor and the people, or entirely by the people, or by the choir alone. In the Dioceses of the United States of America, there are four options for the Entrance Chant: (1) the antiphon from the Missal or the antiphon with its Psalm from the Gradual Romanum, as set to music there or in another setting; (2) the antiphon and Psalm of the Graduate Simplex for the liturgical time; (3) a chant from another collection of Psalms and antiphons, approved by the Conference of Bishops or the Diocesan Bishop, including Psalms arranged in responsorial or metrical forms; (4) another liturgical chant that is suited to the sacred action, the day, or the time of year, similarly approved by the Conference of Bishops or the Diocesan Bishop.
And of course, while we're at it, ccwatershed also has a new hymnal, the Vatican II Hymnal:
The Dominicans at St Albert Priory (and the Eastern Province) have chosen the New Edition of the St Michael Hymnal:
I'm pleased to see these fine efforts, but somehow I expect that I'll be subject to slight variations of the sameold-sameold instead of what the Church is asking for...