The details we know about The JOJOLands thus far is that it will take place in the same continuity as Steel Ball Run and JoJolion. In addition, series creator Hirohiko Araki teased in an interview with Kono Mystery ga Sugoi! that it will feature a descendant of Joseph Joestar from this universe. We first met this Joseph in the final two chapters of JoJolion.
[Source: JoJo News, Kewl0210]