Board Thread:Questions and Answers/@comment-27545423-20160203222642/@comment-168.9.35.17-20160229132053

http://when-will.net/anime/2421-when-is-the-release-date-of-seraph-of-the-end-season-3.html

you can sighn up on this website (although it says winter 2017 T-T) to be notified when the release date for S3 EP1 is announced!