I think we had some additional dates available in 2012. I had booked August 19th, 2012 and we were able to add Free Dining to the reservation.
Here are our dates:
Travel to the Walt Disney World Resort between October 1st - 6th, 2011, October 22nd - November 3rd, November 12th - 17th, 2011, November 26th - December 1st, 2011, December 10th - 15th, 2011, January 8th - 12th, 2012, January 21st- February 2nd, 2012, February 11th - 16th, 2012, March 3rd - 8th, 2012, March 24th - 29th, 2012 and August 19th - September 29th, 2012 to receive Disneys Dining Plan for FREE!