I was asked this question the other day...here's the answer
For the Archdiocese of Louisville, the answer is yes...(and it will always be yes until the bishops of our ecclesiastical province determine otherwise).
In most of the dioceses of the United States, the celebration of the Solemnity of the Ascension is transferred from the Thursday of the Sixth Week of Easter to the Seventh Sunday of Easter (which falls this year on May 20, 2012). The readings and prayers for the Ascension should be used in place of those for the Seventh Sunday of Easter.
How was this decided?
In 1999, in accord with the provisions of canon 1246 §2 of the Code of Canon Law, the National Conference of Catholic Bishops of the United States decided that the Ecclesiastical Provinces of the United States may transfer the Solemnity of the Ascension of Our Lord and Savior Jesus Christ from Thursday of the Sixth Week of Easter to the Seventh Sunday of Easter. Each ecclesiastical province would decide for itself if it would make this change within its province.
What is an ecclesiastical province?
An ecclesiastical province is a way of grouping dioceses under the jurisdiction of an archdiocese. The Ecclesiastical Province of the Archdiocese of Louisville, includes all the dioceses in Kentucky and Tennessee which includes the dioceses of Owensboro, Lexington, Covington, Memphis, Nashville and Knoxville.
Only in the ecclesiastical provinces of Boston, Hartford, New York, Newark, Philadelphia, and Omaha is the Ascension celebrated on the Thursday of the Sixth Week of Easter.