A new TV anime titled M3: Sono Kuroki Hagane has been announced. The official teaser site and an official Twitter account have been opened as well. The anime will debut in April this year, according to the website.

Some staff details (as available) are listed below:

Director: Junichi Sato
Script: Mari Okada
Mechanical Designs: Shoji Kawamori
Studio: Satelight

Official website: http://www.m3-project.com/
Official Twitter: https://twitter.com/M3_anime

Source: Anime Anime, ANN, Yaraon

M3: Sono Kuroki Hagane on MAL


Update March 18
The official site has been updated with a key visual, as well as additional staff and cast.

Staff
Character Original Design: Onigunsou
Character Design: Hideki Inoue
Sound Director: Kounen Hamano
Sound Studio: Magic Capsule
Music: Haijime Sakita
Music Studio: Flying DOG
Studio: Satelight
Producer: M3 Project

Cast
Akashi Sazanuma: Yoshitsugu Matsuoka
Emiru Hazaki: Yoko Hikasa
Sasame Izuriha: Kotori Koiwai
Iwato Namito: Tomoaki Maeno
Kasumi Raika: Sayuri Yahagi
Minashi Maki: Tetsuya Kakihara
Maamu Yuzuki: Misato Fukuen
Heito Isaku: Ayumu Murase

Source: Official site, Rakuten