Okay, gonna do some KOTOR clean up here. It won't be Visas, they made it clear that it's a dark side character, and Visas is not a dark side character despite her being Nihilus apprentice. The SITH triumvirate is my best bet. Sion and Traya would be a cool three way synergy but, they all hate each other so it ain't really a synergy XD But as someone else said, they're 3 pretty big characters. CG did say that "in his wake the dark side is stirring" so I wouldn't be surprised. As for why Nihilus has been revealed first, Nihilus was the flagship character for KOTOR2. He was the main villain in PR. They've also stated they've got a number of "Yoda" style events coming. That is why it is not Revan and is instead Nihilus. They're feeding KOTOR into the game and Revan will be the big one. He is the most iconic character I'm that era and my bet is that we will need 5 old republic characters to get him.
