I keep checking, too. I have two CP's booked for December 25th and we only need one CP! I am trying to book just the restaurant without the CP for either the Garden Grille or La Cellier. Then I can cancel our CP reservation.
We are going to be at Epcot on Dec. 27th, too, so I have even been trying to book either La Cellier or Garden Grille for the 27th, then would cancel the CP on the 25th. No luck on that either.
To make it even harder, we have a group of 10. So...I'll keep trying up until about a week before we leave. At that point, we will have to decide which CP we want to drop, as it will make us 1 voucher over our meal plan if we just keep both CP ressies. Ugh....But I'll keep on checking. I really hope that I find your luck and something opens up.