We have already seen their efforts result in multiple Uprisings against the Alliance by forces from both Empire and Republic, and of course their word is enough to make all three factions rush to Iokath as soon as the radiation subsides.
Whomever this traitor is is apparently female, and is wearing as part of their currently only-known getup the skirt of a Scion. However, for reasons I shall explain momentarily, I think this last fact is a clear attempt at misdirection.
Anyway, I just thought I'd offer my speculation on who this character is and who it most certainly can't be. For this post, I will be basing my suspicions off of the apparent gender of the individual.