> And what happens when there are more men nominated than women? <
No worries. Complicated diversity rules will probably be set up. Maybe...
Old way: Four men nominated for best actor. Four women nominated for best actress. One winner from each group.
New way: Eight nominations for best actor, at least four of whom must be women. Two winners, at least one of whom must be a woman.
CORRECTION: Exactly three of whom must "identify" as male, exactly three of whom must "identify" as female, and exactly two of whom must "identify" as "neither male nor female."
Regards,
This sounds exactly how they would do it.