[UPDATE 07.10.2012] – Apparently many out there are confused about the video below. So let me make it nice and clear for you. The video is NOT a trailer for Season 3. It is a promotional video that simply announces (at 0:34) that a Season 3 has been green-lit for production – (第三期シリーズが制作決定！). When it will premiere exactly has yet to be determined. We will keep you posted.
*Season 3 is announced at 0:34: