Movie Adaptation of Kizumonogatari Confirmed [Update Mar 30]

According to Kodansha Book Club, a film adaptation of Kizumonogatari was confirmed. It's a prequel to Bakemonogatari.

Update on March 30th
According to the official website, Kizumonogatari movie will be premiered in 2012.

Sources: Kodansha, Bakemonogatari official website