Unfortunately there's no indication of when it'll air; hopefully it won't take too long.
|image from 2ch|
In celebration of this news, have some WAI WAI.
Presumably it's taken this long to get the funding to properly animate Nodoka's breasts.
Having not read the manga at all, I don't know where the plot will go. One thing's for sure though - it took all of the first season for Saki and Nodoka to hold hands, so it'll probably be pretty slow going on that front.