Always book, you can cancel if you find something better.
I'm in the same boat. Looking for a discount on my split stay starting on Dec 17th.
MouseSavers shows historical discounts back to 2012. Room only discounts for late fall are generally released much later than the
free dining promotion. For example, discounts in late November-December were started on in 8/27/12, 8/1/13, 7/23/14 and 6/16/15. So I would expect that if they do occur, it won't be for a few months. However, it does seem to be getting earlier every year!