Star Wars: The Old Republic was recently updated, adding more information about the advanced class system which was unveiled late last week. The branching specialization tree won't just allow you to unlock new abilities for your galactic hero -- it will also unlock armor and weapon proficiencies, as well as other "role-defining Abilities." We're guessing "Relentlessly Choking Out Unsuccessful Subordinates" shows up somewhere on one of the Sith Warrior's sets.
Each specialty is broken down into two smaller skill trees, apparently leaving room for specialization inside each specialization. In addition, players will have access to a shared basic skill set, which they'll always have access to, regardless of which advanced path they traverse. Check out the game's blog for more info on how to personalize your spacefarer.