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Doing a little search, it seems both Index season were announced in June and aired in the fall. Railgun season 1 was announced/teased at the end of season 1 and aired the fall of that year.
Considering how much earlier this was announced, combined with the fact it has a 'S' instead of a 2, makes me think this will be airing before next fall. With the sister arc cited as the main focus I wonder if this might be a 12/13 episode season.
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