According to the cover note of the eighth volume of the manga, a new TV series of Saki
was announced. A spin-off manga "Saki Achika Hen: episode of side-A" drawn by Igarashi Aguri
was also announced to be serialized in Monthly Shonen GanGan magazine from August 12th. It's a side story about students in Achika Girl's High School.
Sources: Scan of the cover note