According to the Twitter of the online shop Medio, episode 13 of Saki: Achiga-hen - Episode of Side-A
was announced to be aired on AT-X channel in December. The rest of the episodes will also be aired serially. The announcement was made at Saki Fes. held today. A game of Saki: Achiga-hen on PlayStation Portable will be released in 2013.
Source: Medio staff Twitter