I don't think that they will allow them changing to new servers, atleast not for a long time. Maybe after the first major update/exspansion when new servers have settled down they might if legacy servers are barren, but even then I doubt it.
I do however hope that they allow the duty finder to pull from legacy servers, and that they do not allow trading to cross servers.
75 black mage 75 samurai 75 warrior 75 monk
75 Bard 69 Thief 75 White Mage
Formaly of Unicorn
FFXIV: Ashara Strangelove
Whm 50, Blm 50, Smn/Sch 50, Drg 50, Pld 50, Brd 50
50 War, Bot 50, Mnr 50, Fsh 50