The only "extension" currently offered to
free dining is that certain dates in October, November and December have been offered as part of a targeted discount. The only way to get these right now is 1) to book with a Disney Visa card or 2) to receive an email or postcard with a nontransferable PIN code. There is no current
free dining offer available for the general public.
As for the bounceback offer - you can book that if you are staying at a Disney resort, no matter whether or not you got a flyer in your room. But you do need to know the number to call. Those staying at
DVC resorts are also eligible to make a bounceback package reservation for next year, if they want to forego using points in order to get free dining.