In an interview with Final Fantasy Union, Director Takeshi Arakawa and Producer Yoshinori Kitase reveal some of the new additions and changes for the US version. One of them being new character appearances and abilities for the playable characters.
Final Fantasy Union: You’ve mentioned there are some differences between the Japanese and Western versions; will there be any other differences?
Takeshi Arakawa: You can see new abilities for the characters, which are only available in the overseas version. Also there are some characters which don’t appear in any events in the Japanese version but they do in the western version.
FFU: So there will be a few more cameos?
Takeshi Arakawa: Yes, that’s right.
Source:
Lifestream.net