I believe it will be X-Pac. He was scheduled to appear at a wrestling event my promotion is putting on around the same time, and he backed out; citing this as the reason.
Jerry Lynn announced that his official retirement match from pro wrestling will take place on 3/23/13 next year in Minneapolis, Minnesota. This date is close to the 25th anniversary of Lynn's debut in wrestling. No word at this time who Lynn will be wrestling in his final match.