All the details on the show (staff, characters, cast, designs, and teaser video) were revealed at the end of October in a streaming special event. Shoji Kawamori (Studio Nue) is the overall director as well as the Valkyrie designer. The director is Kenji Yasuda (Satelight), with scripts by Toshiba Nemoto, mechanical designs by Stanislas Brunet, character designs and animation direction are by Majiro and Yuu Shindou (adapting the original designs by Chisato Mita).
A special preview will air on New Year's Eve. In the meantime you can check the official website and this Youtube teaser video:
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