According to official website, an original new school military battle action anime series was announced.

Titled Girls und Panzer, new anime series is about “high school girls x battles in tanks” and will be directed by Mizushima Tsutomi (Another, Blood C, Shinryaku! Ika Musume, xXxHolic).

Furthermore, a manga tentatively titled Girls & Panzer will be also serialized in Comic Flapper magazine this coming June 5.

Here are images from the promotional video

Update: Here is the list of  staff and cast of upcoming school military battle action anime series Girls und Panzer.

Director: Tsutomu Mizushima (Squid Girl, Genshiken, Blood-C)
Writer: Reiko Yoshida (K-On!, Polar Bear’s Café)
Character Design: Humikane Shimada (Strike Witches)
Animation: Isao Sugimoto (Squid Girl)
Original Character concept: Takeshi Nogami (Strike Witches doujinshi)

Yuka Iguchi (Nisemonogatari’s Tsukihi Araragi, Certain Magical Index’s Index)
Mai Fuchigami
Ai Kayano (Lagrange’s Muginami, Medaka Box’s Mogana Kikaijima)
Ikumi Nakagami

Promotional Video

Sources [1] [2]