This from the Disney World website. It shows the new dates. they must have updated it yesterday (Tuesday):
Refurbishments*
In an ongoing effort to improve the quality of our offerings, the following amenities at Disney's Grand Floridian Resort & Spa will be closed for refurbishments:
Sandy Cove Merchandise: August 21 to November 17, 2012
Ivy Trellis Salon: October 20 to December 3, 2012
Gasparilla Grill & Games: September 13 to Mid December, 2012
Courtyard Pool: Mid September to Late December, 2012
The Spa: September 19, 2011 to 2013
These locations are being refreshed for your future enjoyment. In the meantime, you will have access to alternate options during your stay, so you can anticipate a truly grand vacation experience.
* Please note, refurbishment dates are subject to change.