http://www.gamefaqs.com/boards/67289...lia-2/64450255
http://tokkurin.net/archives/50792364.html
..it looks like we can change the model of our character with another character. For example, I could have Elise using Jao's model... the bad news is, they still retain their original moves and voice. The good news, it looks like there will be several cameo characters models that we can use.
Honestly I'm looking forward to this more than costume in-game/dlc.