Jamie Chung (Hangover 2, Sucker Punch, The Real World: San Diego) has been cast as Mulan on the upcoming second season of Once Upon a Time. According to EW, it's a recurring role, though it's not clear yet how exactly Mulan will fit into the show's story. Perhaps magically.

http://www.vulture.com/2012/07/once-upon-a-time-jamie-chung-mulan.html