Over the years I have read interviews and such about where Obsidian was going to go with KOTOR 3, I'll go ahead and share what I remember and try to dig up and edit in the sources. The "true sith" were different from the Sith Purebloods in The Old Republic, but somewhat similar. The plan of the true sith was to cause wounds in the Force all around the galaxy and to wait for the Republic to collapse, causing mass devastation, death, and the surviving Jedi to be limited in number and perhaps even cut off from the Force, in other words; the true sith were poising themselves to win a war that the majority of their enemies had no idea was even taking place, the aimed to win without firing even a single shot.
Another thing was that at one point in the story HK-47 would have been blasted apart (only top half intact) and the player would have carried him around in a backpack; HK-47 would be able to fire his blaster at enemies while being transported in the player's backpack. This would have mirrored the scene where Chewbacca carries C-3PO in The Empire Strikes Back.
would have been found, I've read differing reports as to whether or not we could play as him/her and the Exile. There would have been a location named Mandalore City in the game, so the Mandalorians likely were going to be recruited by the player to help fight the Sith.
Edit: Here is source 1: http://www.vg247.com...on-at-obsidian/
Edit 2: Here is source 2: http://starwars.wiki..._Old_Republic_3
Final Edit: Here is some concept art: http://www.joystiq.c...ii-concept-art/
I was looking for an old leaked youtube video, it showed the Ebon Hawk landing on what was presumably Korriban and two Sith fighting, I can't remember, but I think HK-47 was also briefly in the video. If anyone knows what video I am talking about and posts it, I will be grateful 