They've been done exactly the same as Hull Trains, just FGW logos. It should be seen as Dynamic Lines light as well, there is much less use of vinyls and lines and more plain blue, with the standard darker pink doors.
May has been a date mentioned before. All five need to be refurbished first and crew need to be trained, although apparently the set at Old Oak Common was being used for crew training. I'm not sure but I believe some of the staff that need to be trained on 180s are also crew who need to be trained on 150s which would slow it down. I think this applies to Reading guards but I don't know for certain.