UPDATE:
Nope not Bee Train, this time Kinema Citrus (Tokyo Magnitude 8.0) is producing this as an OVA series.
Staff:
Director: Masaki Tachibana (Tokyo 8.0, Noir)
Writer: Tatsuya Hamazaki (.hack// GU, Legend of the Twilight)
Music: Ko Otani
Character Designer: Atsushi HASEBE
EDIT
oh and Yuuka Nanri is performing a theme song but there is no word if Yuki is attached with her or if she is flying solo.