It has been confirmed that the anime Shingeki no Kyojin ( Attack on Titan ) will indeed have a 4th season.
Rumor – Attack on Titan will no longer be produced by Wit Studio
It's worth remembering that confirmation of new episodes was only a matter of time, since the manga , despite its decline, is still one of the best-selling in Japan and the anime remains one of the most popular.
Finally, the Shingeki manga is published by Panini and already has 3 seasons produced by Wit Studio.
Via: ANMTV