It was revealed at the end of the premiere of the Attack on Titan Part I: Crimson Bow and Arrow (Shingeki no Kyojin Zenpen ~Guren no Yumiya~) compilation film that the second season of the Attack on Titan (Shingeki no Kyojin) TV anime has been slated to air in 2016, where the manga is expected to reach its 20th volume. The animes second season was earlier revealed to be in early pre-production.
The film also revealed the release date for the second compilation film, Attack on Titan Part II: Wings of Freedom (Shingeki no Kyojin Kouhen ~Jiyuu no Tsubasa~) which will be out in Japanese theatres on June 27th next year.
http://animefeeds.com/2014/11/attack-on-titan-2nd-season-slated-for-2016/
Tatakae if old or not trustable news.