http://www.kyotoanimation.co.jp/books/chuunibyo/
http://myanimelist.net/forum/?topicid=381283
Now this is quite surprising. Has KyoAni ever had two series announced ahead of time at the same time? I can only assume that they're both one cour shows, and that they won't air in the same season. But hey, I'm happy. =D It seems to have won some Kyoto Animation prize, the reward for which I guess is getting it animated?
It could also be an OVA of course. I was trying to look on the website for info on format but oh my god it's so slow I give up.