The play by Jean Genet was adapted once into a film in 1974 with Susannah York and Glenda Jackson, but as far as I am aware it's not very well known and it never received any awards attention so it probably isn't as good as the original material's reputation might suggest. That just makes the prospect of modern day adaptation all the more tantalising of a prospect. And, just by the way, adapting a famous international work whether it be a play or a book would certainly help with getting distributor attention across the globe. America and the UK adapt works from across borders all the time. And, hey, you got Isabelle Huppert to visit Australia to perform in the play, who says she wouldn't be willing to come back for a film version?
This promo trailer for the production (which features a new Australian adaptation, just by the way) is even filmed in a way that could be mistaken for a film trailer. There's certainly moments that look more interested in representing the material in a way that wouldn't possibly have the same effect on stage. The image below is just one instance - although looking at the way the stage is set up, it appears that there is a large screen hovering above the stage that allows the production to do certain things with lighting and staging that a play typically could not.