I've not had the chance to go through the full TfW timetable, but there are big changes on Manchester - West Wales Services.
It remains hourly from Manchester at or around xx:30. Odd hours remain as DMUs, mostly to Carmarthen. Even hours are 67 & MKIVs, all to Cardiff only bar the 1630 to Swansea. 2232 remains as a DMU to Shrewsbury that comes from the Chester route, with the loco that arrives at 2215 running ECS to Crewe instead.
To balance it out, the DMUS seem to work Manchester - Carmarthen - Cardiff - Milford Haven - Manchester, so stations West of Carmarthen only get a service east of Cardiff in one direction (though in my experience through passenger numbers are pretty negligible anyway).