This is great news i wonder what the movie will cover some orginal story might be nice since tbh to finish off the first To aru majutsu no index series it probably needs another 2 seasons.
If not an orginal story it would probably cover Touma going to France and Terra of the Left. They already animated his character design, they use it as his pic on wikia. I always wondered why they animated him since he did not turn up in S2.
A movie just for Terra simply isn't worth it and I doubt they'll adapt volume 15 where both Touma and Misaka are absent. Putting together Terra and Aqua's arcs could work pretty well, but I somehow doubt they'll do that. For now, I'm guessing it's a recap movie or an original story (hopefully by Kamachi).
I'll watch it, but I can't get myself hyped up over a movie. They take forever to come out and get to the west.
If this movie is coming out in 2013, then it's entirely possible for there to be a season 3 in fall 2012 covering vol.14-19 and then save the movie for vol.20-22 to end the first Index series. But I guess they would air season 3 first and then announce the movie. Then again, a 90mins movie covering that material will be rushed and probably suck. Guess we'll just have to wait until Oct.11 for more details.
Also, NT vol.3 is announced to be released on Dec. 10th. As expected of Kamachi.exe to keep his 3 volumes/year release rate.
I was not expecting this at all, and I've only read up to volume 13 of the light novels. By the time I finish SS1 I'll watch the movie, it should cover what happens next.
At least I hope it does!
(...Although wouldn't it make more sense to do a third season, then a movie on the last few novels before NT?)