A lot of you guys want to be able to choose weather or not the Revan and the Exile were good or evil and weather they were male or female, but I think more than likely any game the links the two previous games will need to give us some sort of difinative story line. I'm not sure if anyone has ever posted this, but on the kotor II site it has a star wars chronicle, which pretty much says Revan turned back to the dark side.
http://www.lucasarts.com/games/swkotor_sithlords/indexLight.html) go to game info and then Chronicles
Part XI reads.....Time frame: 3,956 B.B.Y.
Period name: Knights of the Old Republic
The Republic verges on collapse. DARTH MALAK, last surviving apprentice of Dark Lord Revan, has unleashed an invincible Sith armada upon an unsuspecting galaxy. Crushing all resistance, Malak's war of conquest has left the Jedi Order scattered and vulnerable as countless Knights fall in battle and many more swear allegiance to their new Sith Master. In the skies above the Outer Rim world of Taris, a Jedi battle fleet engages the forces of Darth Malak in a desperate effort to halt the Sith's galactic domination. During the battle, one of the crippled space craft jettisons Jedi BASTILA SHAN, after fighting valiantly against a boarding party including Malak's new apprentice, DARTH BANDON. Her escape pod is located in the Undercity of Taris by a human suffering from amnesia, Mandalorian Wars hero CARTH ONASI, a Twi'Lek scoundrel and native of Taris, MISSION VAO, and her Wookiee companion, ZAALBAR. Seeking refuge, the legendary smuggling ship EBON HAWK is appropriated from Taris underworld boss Davik Kang, and piloted to the Jedi Enclave of DANTOOINE. Soon afterwards, the human amnesiac begins to exhibit impressive use of the Force, and is trained by Jedi Master ZHAR LESTIN.
After a number of dangerous and foolhardy missions throughout the galaxy in search of cartographical tools known as Star Maps, the members of this small alliance are detected and detained on the gigantic Interdictor-class Star Cruiser Flagship LEVIATHAN under the command of Admiral SAUL KARATH. Karath was a pivotal Republic figure only five years previously, winning victories over the Mandalorians, but recently declared the Republic not worthy of his support. After an impressive display of guile, the alliance was released from the ship's brig, and attempted a full-scale assault of the bridge, fatally wounding Karath. During the escape, however, Bastila and the amnesiac Jedi Knight are waylaid by the appearance of DARTH MALAK, who reveals that the Knight is in fact DARTH REVAN, his old Master. Escaping to the UNKNOWN WORLD of the Rakata, Bastila turns on Revan, and after a climactic battle, Revan learns of Malak's plan to harness a nearby sun using an ancient Rakata space station known as the STAR FORGE, and use this energy to increase production of his Sith forces. Revan vows to slay his ex-apprentice before Malak's power becomes too great.
Personally I don't think a Jedi would vow to slay anyone, but this isn't much proof as to what Revan decided to do. I believe a true jedi, especially one who has turned from the dark side would vow to defeat or stop Malak but not slay.
Part XII reads.......ime frame: 3,955 - 3,953 B.B.Y.
Period name: Knights of the Old Republic 2: The Sith Lords
It is a period of uncertainty across the galaxy. After a long and vicious battle in the deepest area of the STAR FORGE, Dark Lord of the Sith DARTH REVAN succeeds in destroying his ex-apprentice DARTH MALAK. After recovering from the duel, Revan seeks out the secret dark outposts he established during the Mandalorian War. Journeying to the Outer Rim in the EBON HAWK, Revan is focused withlocating the source of the dark power on MALACHOR V. Those awaiting Revan's arrival, including members of the Sith and the Jedi, are shocked when he fails to return from this pilgrimage. It is unknown whether Revan destroyed or resurrected the primal Sith forces on this forbidden planetoid.
The rest of part 12 has more to do with KOTOR 2, but the fact that they actually refer to Revan as the Dark Lord of the Sith probably means we remained evil. Not to mention he's looking to return to Malachor, could be to destroy it but probably not.