The timetable on the GA website is still that from 9th December 2018. When I spoke with them yesterday they said the new timetable has not yet been published and, in answer to my question about early and late trains, said that with new timetable/trains coming coming in, this (early and late trains) may be the case but that (the person I was speaking to) wasn't aware of the specifics so it would be best to wait until the timetable has been published. Make of that what you will.