The new anime Maou Gakuin no Futekigousha ( The Misfit of Demon King Academy ) will only have 12 episodes according to information published via Twitter.
The animation is by the studio Silver Link (Dusk maiden of Amnesia) Shin Oonuma takes the chair of chief director (Fate/kaleid liner Prisma Illya), the direction is by Masafumi Tamura (Two Car, Wise Man's Grandchild).
Synopsis: When Anoth is reincarnated in the hope of a more peaceful life, he ends up attending school with his descendants in his ancient castle 2,000 years later. But with magic disappearing in this era, no one can appreciate Anoth's true power!
Via: Twitter Maou