It seems a third Knights of the Old Republic was being considered even during development for the second.

Chris Avellone has been sitting down to discuss his Obsidian team’s initial plans for the franchise’s fabled finale.

The Sith Lords creator told Eurogamer –

“When we were plotting out the idea of doing the third game, we just thought it would be cool if we were foreshadowing what Revan was really doing in Knights of the Old Republic 1, and what he was preparing for in Knights of the Old Republic 2, and then bring it to a close, the end of the trilogy.”

Knights of the Old Republic 3 would still involve the Ebon Hawk ship, your base and your home, and you’d have “a few” of the companions from the other KOTOR games. “You definitely have T3-M4 and HK-47 with you,” he says, and at one point HK-47, its legs dismantled, would “ride around in your backpack like C-3PO does with Chewbacca in Empire Strikes Back”. “So during one of the sequences in the game,” Avellone expands, “you’d actually have HK-47 firing behind you and being your cover support while you’re carrying him around on your back and getting to a repair station.”

Read the whole article over http://www.eurogamer.net/articles/2013-07-31-fear-is-the-path-to-the-dark-side