Here's the PV!
http://www.youtube.com/watch?v=1G60KY1kaPs
Here are some screenshots:
Also, Saki: Zenkoku-hen is announced too. They're going to animate Miyamori, Himematsu and Eisui! But for now, the 13th episode of Achiga airs on ATX at December 16 if I'm not mistaken.