I am leaving next week and I was wondering the same thing. I've seen him there on past trips, but never took the kids to sit on his lap or take pics or anything. I was wondering when he was going to start showing up there and if there was a place I could find a schedule for him.
I do know at American Pavillion in Epcot, they have Santa AND Mrs. Claus and they do have PhotoPass photographers there. They are also present at the MK location as well. So there is a good possibility there will be a PhotoPass photographer at the DTD location, too!