Well, in an attempt to return back on topic, I'll post some more thoughts on KOTOR III (some which have come from other threads, but go figure )
I think the Exile will eventually travel to the Unknown Regions, out to find Revan (whether or not she'll be alone or with a small group is unclear at this moment, but I think she will be alone). She will come face to face with Revan for the first time since the destruction of Malachor V. They have some climactic battle (as mentioned before, Duel of the Fates should be the music here), and during the fight, the Exile realizes she cannot defeat Revan, who has become part of the True Sith.
Now, at this point, I'm not 100% sure anymore if the Exile should refuse the Dark Side, or succumb to it donning the mask of Darth Nihilus...