I'm betting on QS. There has to be a QS on that side of the park. If you are in Pandora, the closest QS would be Flame Tree, which isn't that close. Harambe market would be the next closest, I think.
I'm guessing it will be food court service, similar to POR Riverside mill, or Sunshine Seasons at Epcot. This style of QS is much more efficient than counter service where you order and pay, then wait for your food at the counter.
With Rainforrest, Tiffins, Yak and Yeti, and Tusker, AK doesn't need another TS restaurant. Especially as all 4 have plenty of day of availability for lunch and dinner. Maybe not for the first few months, but, long term, Pandora isn't going to draw in enough additional people to fill up the current restaurants, as well as fill up another restaurant.