As well as lots of bikinis / toplessness, I predict that two characters will develop feelings for each other and have to explore their burgeoning lesbianism in some detail...
I said exactly the same thing to my OH.
Lord of the Flies is an allegory the kids on the island are society and it becomes a war within a war. As society is beset with patriarchal structures it represents that and shows displays of masculinity with the inevitable violent conclusions to this. Yes, Simon is the individual and the flash of morality and differing styles of government are represented but the facts are if the cast of the novel were not male the story would change as the ritualism of the hunt and the violence would not be the same. It couldn't be the same as girls are socialised differently. So remaking it with girls is a nonsense, if you were faithful to the novel's story it would be a highly unlikely conclusion and if you changed it to reflect how a matriarchy would proceed it would be another story entirely taking only the premise of the novel as a starting point. Which may be an interesting idea for a story but NOT a remake of LORD of the Flies.
It's just BS and yes, as said by weary voices here (who have seen all this shit before and know where it is heading) probably a thinly veiled excuse for yet more female nudity (there just isn't enough of it in films donchakno) and maybe a bit of hot lesbo action.
BTW I've taught this book several times and I always reread it. I've read it A LOT.