Fate/Zero is the prequel of the Visual Novel series , Fate/Stay NIght and was originally written in the context as a
Light Novel.
But it is now receiving greenlights as a new Anime series , possibly being released around 2011.
Fate/Zero features Emiya Shirou's adoptive father , Emiya Kuritsugu as the protaginist and Servant Saber ( The very
same Saber ) as his Servant.
The heroine is Irisviel von Einzbern , Illyasviel's "mother" and the other six Masters and their Servants
of the war , which includes characters like Tohsaka Tokiomi ( Rin's father ) , Kotomine Kirei , Gilgamesh and
Waver.
This particular War takes place ten years ago from the original setting of Fate/Stay Night , so the lineup of characters is different as it is a prequel.
News comes from : http://www.animenewsnetwork.com/news/2010-12-21/fate/zero-novel-gets-anime
Official TV Site : http://www.fate-zero.jp/