Do you think there's a chance they'll change the itinerary due to the hurricane activity?
It depends on the hurricane track and any damage it does along the way. I've had cruises that were changed from western to eastern itineraries because of hurricanes. Believe me, I didn't mind. It is not the cruise line's fault and they will never risk the passengers or the ships if at all possible. RCI posts storm updates on their website. All I can say is to check the RCI website frequently between now and then. Given the storm track, Gustav will be out of the way for your cruise and it will be up to whatever damage it did to your ports. I do know that RCI cancelled all visits to Labadee for the next couple of days.