One major character was introduced at the event. Darth Sion is a Sith Lord boss. Both Parker and LucasArts' Producer Mike Gallo were mum as to whether he's the main antagonist, but it was clear he will appear more than once as the adventure plays out. In the demo, he was aboard a ship called the Harbinger, an event that apparently takes place fairly early on, and that seems to mark his first appearance. He debuts via a lengthy cutscene, almost all of which was removed so as not to provide story spoilers. Visually, he's very easy to see as evil incarnate, his torn, scabrous, mutated body held together by the combined force of sheer hatred and the power of the Dark Side. If he's not the ultimate villain - and since it was stated there are other Sith Lords, my guess would be he isn't - it will be interesting indeed to see who is.