I just watched it and felt the urge to quickly let some things out.
Although it looked like they were just going to cut it off after the exam part, there's almost certainly going to be an original ending now. ;_; Aya-tan-tachi seem to be heading to the Church to 'eliminate anyone who can use the Eye' or something like that - wtf? You're supposed to be busy in Antwort right now! So yeah, there are two possible endings that I can see now:
1. Conclusive ending with Teito confronting Aya-tan and... and... (I can't bring myself to say it T_T)
2. Original yet not conclusive ending (some fighting, Teito escapes like in the manga or smth), which would give us hope for a sequel... (what are the odds, seriously? *sigh*)