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 is worth remembering that confirmation of new episodes was a matter of time, since the manga , despite the drop, is still one of the best-selling in Japan and the anime is still one of the most popular.
Finally, the shingeki manga is published by Panini and has already produced 3 seasons by Wit Studio.
Via: ANMTV