I was wondering about this too as we're on the Magic next week. I called reservations and the service rep told me that tables are 4, 6, or 8. We are a family of 4, traveling with another party of 3 so I asked, kind of tongue-in-cheek, if we would just be at an "8" table or if they'd seat a single person with us. She was "noncommittal" (to put it nicely).
I see by another reply above that tables can have even more than 8? I'm assuming this might be large groups who request it?