It was announced on Adult Swim’s official Facebook page that The Promised Neverland (Yakusoku no Neverland) will be coming to Toonami on April 13. The show will air in the 12:30 am to 1:30 am block alongside Sword Art Online: Alicization.
The Promised Neverland just finished airing in Japan and a second season was announced to air in Japan at some time in 2020.
The official announcement key visual can be seen below:
MyAnimeList.net describes The Promised Neverland as follows:
Surrounded by a forest and a gated entrance, the Grace Field House is inhabited by orphans happily living together as one big family, looked after by their “Mama,” Isabella. Although they are required to take tests daily, the children are free to spend their time as they see fit, usually playing outside, as long as they do not venture too far from the orphanage—a rule they are expected to follow no matter what. However, all good times must come to an end, as every few months, a child is adopted and sent to live with their new family… never to be heard from again.
However, the three oldest siblings have their suspicions about what is actually happening at the orphanage, and they are about to discover the cruel fate that awaits the children living at Grace Field, including the twisted nature of their beloved Mama.
