Maybe it's just me, but I thought Star Wars: The Force Unleashed pretty much answered all of its own questions. The protagonist dies, returns to life in time to not kill the Emperor, and heroically sacrifices himself to help the birth of the Rebellion. Case closed. Perhaps the question the sequel will answer is how can Starkiller be the main character of Star Wars: The Force Unleashed 2 when he's dead. Is he a clone?
It at least appears possible, from the artwork on the opening page of the The Force Unleashed 2 website, that his resurrection has something to do with the clone facility on Kamino.
The trailer looks great of course, but here's the big question: Can LucasArts resolve the story flaws, repetitive gameplay, and relatively short single-player campaign that made the first game such a disappointment in some fans' eyes? It sounds like the people behind The Force Unleashed 2 are aware of some of what went wrong and are working hard to make this a better game.
I can't help but want to double-lightsaber a rancor in half after watching the trailer.