I really hope it's the creation of Paradise Island. I really don't want Diana to be born this early and do nothing for the in the world for 3000 years.
And I doubt Kelly has any interest in doing it this early. These women getting their paradise is the perfect hopeful end of the first arc. And the biggest reason why I doubt it is that Kelly Sue doesn't actually get Diana. This isn't a criticism, it's what she said in an interview. Diana is too clean for her. She doesn't have a wound, trauma (this is sort of true, but also not). So I don't see her introducing a huge character this early when she doesn't really connect with her.