Premieres sometime in 2025. The new PV is here. Check out the Crunchyroll article or previous announcement post for additional information. Synopsis from AniList:

After a mysterious death, King Grey is reborn as Arthur Leywin on the magical continent of Dicathen. Although he enters his second life as a baby, his previous wisdom remains. He begins to master magic and forge his own path as the years go by, seeking to correct the mistakes of his past life.