Lame spec, but...
From Yahoo's 'exclusive' spoiler section on The Force Unleashed:
Lucas Arts is keeping specific details about the plot tightly under wraps, but here's what we know so far. The game takes place in the roughly twenty-year interim between the end of Episode III and the start of Episode IV. Under the watchful eye of Emperor Palpatine and led by the iron hand of Darth Vader, the Empire has tightened its grip on the Republic and the few remaining Jedi have all but vanished. But unbeknownst to the Emperor, Vader isn't simply in it to bring order to the cosmos. He's got other plans.
That's where you come in. As Vader's undercover agent, you take on deadly, top-secret missions all across the famous galaxy far, far away. It's a tale of duplicity, as not even the Emperor knows about your actions, and at the moment, neither do we. More details about the game's intriguing story - as well as insight into what famous characters you might meet up with along the way - will hopefully be revealed in the coming months.
Other plans? What the? Of course, more likely, the plan would just be mere silliness and nothing to do with the KOTOR Series, but still. Endless spec for the win.