Such good news! And the voice actors for at least 11 characters in season one will be returning, including the seiyuus for Tatsuya, Miyuki, Erika, Leo, Mizuki, Mikihiko, and Mayumi. Iwasaki Taku, the composer for season one, will be returning. The director will be Yoshida Risako, the director of the movie.
Satou-sensei left a message on the official website (mahouka.jp). He says that this season will be different, because it has an "occult color" (okaruto-iro). His says that the most significant thing about this season will be "team play sustained by friendship (one part love)." I'm really looking forward to season two!