From what I have heard the weekday evening departures from Dublin will be 1630 to Wexford 17.30 to Wexford and 18.30 to Rosslare. The 18.30 will still be the last train of the day
The proposed 17.00, 18.00 and 19.00 times have been dropped as it appears IE received a number of complaints about changing the 1640 and 1725 departures.