Rita became a hurricane about two hours ago, and is currently moving through the Florida Strait between the Florida Keys and Cuba.
We are currently getting some strong bands in Miami, with heavy rain and 40-60 MPH winds, but WDW has probably already seen the worst they will see from Rita. Actually, Rita may pull out any ugliness and you may have beautiful weather.
There is no expected tropical development for the next several days, so you should be fine.