An advertisement for the February issue of Kadokawa's Young Ace magazine has revealed that an anime adaptation of Gen Urobuchi and Type-Moon's Fate/Zero novel has been green-lit. Urobuchi, the scenario writer best known for the software from Nitroplus, collaborated with the software studio Type-Moon to write a prequel to Type-Moon's Fate/stay night visual novel software. The story is set a decade before Fate/stay night and reveals the 4th Holy Grail War that sets the stage for the war in the software.
The original Fate/stay night software already inspired a television anime series from Studio DEEN; Geneon Entertainment released that earlier anime in North America.
The February issue of Young Ace will ship on December 29. The artist Shinjirō is launching the manga adaptation of Fate/Zero in this issue.
[Via livedoor, Yaraon!]
Update: More background and story information added.
Update 2: Katsushi Ota, the editor of Kodansha's Faust literary manga magazine, has posted the address for the Fate/zero anime's website via his official Twitter account.
Update 3: Advertising for the sixth volume of Type-Moon Ace confirms that the anime studio ufotable is involved.
Update 4: The sixth volume of Type-Moon Ace lists Ei Aoki (Ga-Rei: Zero, Girls Bravo) as the director. Tomonori Sudou (Coyote Ragtime Show, Kara no Kyoukai - the Garden of sinners) and Atsushi Ikariya are adapting the original character designs by novel illustrator Takashi Takeuchi (Fate/stay night, Kara no Kyoukai - the Garden of sinners, Tsukihime, Lunar Legend).