When does Deadman Wonderland return?

Deadman Wonderland is a Japanese manga series written and illustrated by Jinsei Kataoka and Kazuma Kondou. It was serialized in Kadokawa Shoten's Monthly Sh?nen Ace from April 2007 to July 2013, with its chapters collected in 13 tank?bon volumes. A 12-episode anime television series adaptation produced by Manglobe aired between April and July 2011.