Back in the early stages of the current Fallschase plans, a movie theater was proposed for the Southeastern corner of Mahan and Bucklake Road. This is the part of Fallschase that is across Bucklake Road from the Front of Costco. At the time, there was no mention as to who it would be, but it seems like a smaller location than what AMC currently has.
I understand that the Panera is ready on the inside, but they have decided to back away from opening, at least for the time being. With that mall losing more tenants than what they possibly might be gaining, it would probably be in Panera's interest to not open. With the Dillard's gone, that area of the mall is just a dead end.