There is a good chance that your room will be ready, depending on how busy the house keeping staff is. They usually clean those rooms first. This past April I spent 5 days at the Cabins at Fort Wilderness, my family and I arrived at the resort at 7am and our room was ready. I know that is really lucky on our part, but even if the room is not ready, they will store your luggage in a secure place. This will allow you to have fun at Disney World, until your room is ready. So go and have fun at the Happyest place on Earth.