[SPOILER="Spoiler"]
[Image: http://i.imgur.com/eeFXG.jpg]
[Image: http://i.imgur.com/VITSJ.jpg]
[/SPOILER]...In the story, just before the completion of the Academy City space elevator "Endymion," the main characters Kamijo and Index encounter a level 0 girl named Arisa. The Magicians are after Arisa, and they attack Academy City. A female leader named Shattoaura leads a unit from Academy City against the attack. Kamijyo and Index learn from Stiyl that Arisa is key to a brewing war between the sides of Magic and Science...
...The film is slated to open in Japan in February 2013.
...Hiroshi Nishikiori (Magic Tree House, Azumanga Daioh, Angelic Layer) is returning to direct the project at the studio J.C. Staff (with CG produced by Sanzigen). Hiroyuki Yoshino (Macross Frontier, Accel World, Code Geass: Lelouch of the Rebellion) is scripting the film based on Kamachi's new story. Maiko Iuchi (Waiting in the Summer, Dog Days) is returning to compose the soundtrack...
Source - http://www.animenewsnetwork.com/news/2012-06-07/toaru-majutsu-no-index-novels-haimura-draws-film-new-characters
Considering how the script for the film is being written by the author, I don't expect it to end up being bad. Taking a quote for an anon, it's most likely going to be a naruto-tier movie in that it has nothing to do with the main plot, yet delivers on the main aspects you'd expect from the series. Also since it's a movie, I don't think there's going to be too much fan service, though I wouldn't count on it. Would be really nice if they toned down on it and actually made it an impressive showing. But with that date I doubt we'd be seeing it any time soon.