there is a cast release... different actor is playing 4th sister
"The talented voice cast includes Diana Lee Inosanto (Morgan Elsbeth), Meredith Salenger (Barriss Offee), Rya Kihlstedt (Lyn, aka Fourth Sister), Wing T. Chao (Wing), Lars Mikkelsen (Thrawn), Jason Isaacs (Grand Inquisitor) and...