The adaptation is hardly a surprise, not long after CrossOver is released. I haven't had a chance to actively get into the games, so this should be a nice introduction, so long as the right studio's working on it.
...and the idea of getting yet another OP/ED set from Ayane and Asriel, respectively, makes me more than happy. I'm sure 5pb will have they say in who sings what for the anime too, so changes shouldn't happen... I hope. Midonin, I'm counting on you to post the theme song announcements whenever they appear!