The second Attack on Titan Blu-ray has revealed that writer Satoshi Shiki (Kami-Kaze, Riot) has been attached to an Attack on Titan: Before the Fall manga, set to run in Shounen Sirius magazine starting with the issue that goes on sale August 26th.
Three Attack on Titan: Before the Fall prequel light novels, written by Suzukaze Ryo and illustrated by Thores Shibamoto (Trinity Blood) , have been released in Japan. The first follows the the development of the 3D maneuver gear as the scouting legion struggle without knowing the titans' weaknesses.
The second follows the youth of Kyklop, who was discovered as a newborn in a mass of titan vomit. The third returns to Kyklop as he battles titans with a set of primitive 3D maneuver gear.
From the light novels...