User blog comment:IamJakuhoRaikoben/Chapter 480: The Northern Gravestone, Review./@comment-5303512-20160404151842/@comment-4829046-20160405115517

They have no reason to make a brand new one. That only happens once an anime has aged. The chapter mentioned 4 special anime-only content episodes that are written by the author but directed by different people. The main anime is a separate season and a will likely cover the Ten Commandants to some extent. The latter is by the same staff as the first one.