High School DxD Hero was just confirmed as the fourth season of the popular novel series High School DxD

High School DxD Hero S4 staff.

Studio: Passione (Rail Wars, Rokka no Yuusha)
Director: Yoshifumi Sueda (mostly an episode director for action shows, but has done work on Dakara Boku wa, H ga Dekinai as an assistant director on the show/ lead director on the OVA, and head director of the hentai Nee Summer. The man has experience in the oppai.)
Series Composition: Kenji Konuta (mainly worked on Blood Lad and is working on this season's Ousama Game)
Chara Design: Makoto Uno (has done loads of hentai, most notably Angel Blade. Also worked as lead character designer on Seikon no Qwaser. He an oppai man too.)
Overall, I'm excited to see DxD back, but a little upset that the original team at TNK isn't working on it. My brain defaults into those designs. I have faith in the show, as the author has confirmed that it would be more faithfully following books 9 and 10.