It's never been exactly 72 hours. I suspect the curtain position will be clarified in the next 24 hours. For GVA and FRA it isn't unusual for it to be late. I would keep an eye on it after lunch tomorrow, the aircraft could also be swapped around, and yes you are at risk of being cast out of 12 if the curtain goes back. GVA is the one route where this may well happen. I'd go for the rear emergency exits if I were you, if it is an A321.