They've already started casting for Season Two:
Jamie Chung - Mulan
Some more details about Mulan’s character. She’s described as having been trained in weaponry, tracking and riding, but “has a spirituality that enhances her tactical and strategic abilities. She has suffered past betrayals, so her trust is hard-won, but once she gives her oath of friendship her loyalty knows no boundaries.” Also, “when she falls in love, she falls hard.”
Sarah Bolger - Sleeping Beauty/Aurora
While there is no confirmation on it yet, most think that since Aurora is cast for Season Two that we have not seen the last of Maleficent, played by True Blood's Kristin Bauer van Straten (Pam).
So far those are the only known new characters for season two.