I've been waiting for someone to do this movie for ten years.
Well, that and for someone to do the black patent leather bondage Wonder Woman that Marston originally envisioned, but that was never going to happen.
I hope against likelihood that they'll keep the poly relationship as it was - super functional and stable. The kids had different pet names for the two moms, and after Marston died, Elizabeth and Olive continued to live together with Elizabeth financially supporting the family and Olive taking care of the children. They lived together for 64 years.
This often gets downplayed as Elizabeth "accepting" another woman into their marriage, but truthfully the three were (more than would be expected considering the times) pretty equal in their relationship.
My favourite quote from this article