As Palpatine rises to power and the Empire begins its conquest of the galaxy, Vader sends his apprentice to help exterminate the remaining Jedi. Your character has four primary Force powers to develop during missions to eradicate the Jedi: Force push, grip, repulse and lightning. Powers can be used together to create unique combos and cause massive destruction to enemies and the environment.
The next-gen versions of Force Unleashed utilize some new technologies that promise realistic environmental reactions. Beyond having wood splinter and plants bend in the wind, non-player characters also act and react more realistically. Characters are said to adjust their behavior on the fly, based on the player's actions. It's unknown how the PS2, PSP and DS versions will differ.
Created under the direction of George Lucas, Star Wars: The Force Unleashed offers new insights into the Star Wars universe. And it lets you kick some Jedi ass. Look for eyes-on impressions of The Force Unleashed in a few weeks.