http://www.mediafactory.co.jp/comic-...etail&id=33562
By the company that publishes the manga. They announced a Non Non Biyori manga anthology for 2014/09/23, but in the announcement they mention the anime second season.
のんのんびより 公式アンソロジー あきっ！
TVアニメ第２期製作決定!! 公式アンソロジー第２弾！
Non Non Biyori official anthology!
TV anime second season production decision!! Official anthology vol. 2!
Koma-chan plushie: