Having been shown all the races that will be appearing in Final Fantasy XIV, it was very apparent that they are basically the same except renamed from Final Fantasy XI.
During E3, Hiromichi Tanaka, director of Final Fantasy XIV had this to say about the potential of more races "From a game design point of view, we do have other races already prepared, but during the development process we had to put priority elsewhere and due to the schedule we had to give up. In the future, if we have enough man power, it is very possible to add it to the game."
This sounds promising for potential expansions, but considering that additional characters will cost players more to use, it seems a bit questionable whether Square Enix will pursue adding more races.
Source: Final Fantasy Union