Information I have is limited but a shuttle service from Clonmel to Waterford is planned.
Some limited extra trains Waterford Kilkenny as well, but there is massive unused capacity on the Kilkenny Waterford leg of Dublin services.
Talk of evening services as well and given Waterford has several 6 coach ICR's overnight there is capacity there to move a large number
Waterford Rosslare or even Campile is out not due infrastructure but a lack of trains. Clonmel is the largest inland town in Ireland so it does deserve priority
Its only 21 days away and Irish Rail have made no statement or uploaded it into the timetable