You were expecting an announcement, but it was me, Dio!
Earlier today, Warner Brothers announced that a fourth season of the Jojo’s Bizarre Adventure anime series is in the works. The announcement was made in a teaser that played at the end of “The Last Crusaders” fan event in Tokyo.
The new season will adapt the manga’s “Diamond Is Unbreakable” arc, which follows Jōsuke Higashikata and his companions. As of press time, no staff, cast, or broadcast data is officially available.
Source: YouTube (Warner Bros. Anime)