News Holyhead Port Re-opening on 16 January

Just saw that Terminal 5 at Holyhead is set to re-open for ferry traffic on 16 January. It's great news for travelers, but I noticed that Terminal 3 is still closed. Does anyone know more about the situation or have experience traveling through Holyhead? I'm curious about how this might affect ferry schedules and travel plans, especially for those heading to Ireland.