The sequel series to Knights of Sidonia will air starting on April 11, 2015, JST (so April 10 for a some of us). The series looks to be 12 episodes long, similar to the first season.
Official Website:
http://www.knightsofsidonia.com/
Based off the manga by Tsutomu Nihei, this sequel to Knights of Sidonia continues the story of humanity's last hope of survival, a colonial ship named Sidonia. The main character and ace, Tanikaze Nagate, defends Sidonia and battles the mysterious alien species, the Gauna, who are out to destroy humanity for unknown reasons. The seemingly indestructible Gauna are destroyed when their core is shattered by using a lance, Kabizashi, whose tip is attached with a unique and rare alien element.
I'm excited for the series. The first season had some nice suspenseful moments, and the action was fantastic. I really do hope they improve on the CGI this season.