Are you staying on-site at Disney? ; By all accounts I've read, on the rare occasions when WDW has been hit, they've really gone above and beyond to make things as easy as possible for their guests.
Unless a hurricane hits directly (and they I don't think the eye goes right across the middle of the state too often... altough I admit I haven't paid that much attention most years), as long as you're prepared for the possibility of a wet week, you'll probably be fine. ; And remember... these folks are well versed in how to prepare for and get through hurricanes, you can probably trust them to let you know what you need to do, and to ensure your visit is a safe one!