Star Wars: The Old Republic:

Ohlen went on to explain that each of the game's two factions will contain various classes, each with its own unique backstory. So far, the only classes confirmed are the Jedi and Sith, which will allow players to wield lightsabers and force powers "very early on," versus well into the game as was the case with the first KOTOR.

(The game summary also describes another possible class, the Republic Special Forces, "elite troopers [which] work often in conjunction with the Jedi.").