Well I hope the story unfolds the way I envisioned in my theory. I see this game being the revelation of a bigger picture. What happened in Kotor was all planned.
If you remember talking to Canderous in K1 he tells you that the Sith came to the Mandalorians with an offer to fight against a worthy opponent. Who was this worthy opponent you ask... none other than Revan. I think the MSG was the guy behind it all. He started the Mandalorian War to weaken the Republic and turned Revan to the darkside so that he can attack the Republic to weaken it even more so that he could take over, brilliant plan in my opinion.
What I don't understand is what happened on the outer rim. If Revan was turned by the MSG then why did he claim the title of DLOTS and Malak as his apprentice instead of our new PC. Did the MSG tell him to take the title as part of his plan? Beats me.
However, I don't think the MSG counted on the Jedi capturing Revan and wiping his mind. That could have been a snag in his operation but not a big one.
I have no idea where Sion or the Lady Sith could have come from. There are a lot of holes in my theory but I stand by it. Nur Ab Sal absolutely tore it apart, so feel free to do so.