About time you say? According to the Japanese Kyo mo Yarareyaku fan blog, it is reported that a Japanese Tsutaya store had put up an announcement stating that the second season of Toaru Majutsu no Index will be coming out this Fall. No further information asides from the little picture that is taken from the blog above.
The picture above translates as “Sequel confirmed! 2010 fall! Toaru Majutsu no Index…” and it gets a little difficult to read because of words being so small.
Since there’s no official announcement yet and all, we’re all free to speculate.