Gellar may have also revealed a big clue as to what part she is playing as the actress posted an image of herself as Princess Leia on Instagram (via theforce.net).
I'm super excited to announce that I will be on the #StarWarsRebels panel at #NYCC on 10/8, 1:30pm, on the Empire Stage (of course). Hope to see you there! #StarWars @starwars Now whatever should I wear?
We can speculate Sarah Michelle Gellar will be the voice of a young Princess Leia as Star War Rebels is set a few years prior to A New Hope.
Regarding Gellar's question about what should she wear, is there really any question?
Star Wars Rebels Season 2 NYCC panel details:
Thu. October 8| 1:30 PM - 2:30 PM | Empire Stage 1-E
With new episodes of the exciting second season of Star Wars Rebels debuting on Disney XD this fall, Fans will get an exclusive sneak peek of what's to come in a Panel featuring Special Guests and a discussion of the new storylines and characters being introduced throughout the new season. Now considered a very real threat to the Empire, the crew of the Ghost has caught the attention of Darth Vader himself, who will stop at nothing to hunt them down. Undeterred, the rebels will seek out old friends and add powerful allies to their cause, forming the beginnings of a more formidable alliance against the Empire. Find out what's coming in the highly-anticipated second season of Star Wars Rebels and be sure to return to the Empire Stage at 5:30 PM for a sneak preview of two new episodes from the series!