According to Access Atlanta, Mockingjay will return to The Swan House very soon to film additional scenes:
The historic building on the grounds of the Atlanta History Center was the site for a good bit of filming for "Catching Fire," the second in the "Hunger Games" series. Elaborate party scenes were filmed on the grounds and interior scenes were filmed in the dining room. An upstairs room served as President Snow's office.
The series finale, "Mockingjay," which will be split into two movies, returns in a few weeks. The Swan House staff is readying for the movie's return by emptying out the living room on the main level, close to the dining room.
Additionally, CLCasting, who have been doing most of the extras casting for Mockingjay Parts 1 & 2, have announced a "Last Chance" opportunity for casting in the "Untitled Trilogy" (which we all know is MJ). The types they need are things like "GREAT LOOKING MEN AND WOMEN" for a "Mansion" scene, "Peacekeepers," and "Council Men and Women." All of these parts shoot between March 26th and April 17th, which is supposedly the last day of shooting in Atlanta.
Sounds like they could be shooting the scenes in Mockingjay where Katniss and Snow have their final confrontation in his quarters, where Katniss reaches City Circle and Snow Mansion, and maybe even you-know-what (major twist) scene on the front lawn of Snow Mansion. And if you don't, go back and read Chapter 26.
Director Francis Lawrence talks about this particular scene in the Catching Fire filmmaker commentary:
"It was fun to design the entrance to [Snow's] house that will become key in the next movies, in Mockingjay. The entrance from the square - there's a big scene that takes place in Mockingjay right outside the house here."
Thanks to our friend strawberrycupcakeprincess for the tip!