Since the casino discount varies based on the cabin type booked, with a greater discount for booking insides, and smaller discounts for higher categories, I'm wondering if those of us who are given the casino discount are automatically overlooked by the upgrade fairy.
If they've upgraded you and there are cabins in the same category are more desirable, you can easily call in and get a room change. You probably already know that, though.
Good luck ... hope you get a cabin you like.