According to Enterbrain's Charaberrys magazine web page, a manga "07-Ghost" will be animated. It will start airing from April 2009.

Source: Enterbrain

07-Ghost manga is published on Comic ZERO-SUM magazine and its Tankoubon were published up to volume 6.

Note: They erased the 07-Ghost anime information from the web page. The first official announcement was supposed to be done in the ZERO-SUM magazine to be released on Nov 28th. This was a premature disclosure.

Edited on Nov 25th==========
The official website of 07-Ghost anime was opened.
official website

Staff
Director: Takayama Norihiro ("Ufo Princess Valkyrie")
Series organizer: Takahashi Natsuko ("Moyashimon")
Character designer: Fujii Maki ("Kannazuki no Miko")
Graphic art director: Ban Yukiko ("Amatsuki")
Production company: Studio DEEN

Cast
Teito Klein: Saiga, Mitsuki
Frau: Suwabe, Junichi
Castor: Chiba, Susumu
Labrador: Miyata, Kouki
Ayanami: Hayami, Shou
Hyuuga: Hamada, Kenji
Kuroyuri: Saito, Chiwa
Konatsu: Kishio, Daisuke
Haruse: Hatano, Wataru
Katsuragi: Nakai, Kazuya
Shuuri: Irino, Miyu
Bastian: Kirii, Daisuke
Father: Kiuchi, Hidenobu