Yeah, I don't know. And honestly it's about gameplay over story for me. I thought the story was fun and fine, but it could have sucked as long as the gameplay was fun.
The trailer http://www.gametrailers.com/video/star-wars-spike-tv/59817 does show the same apprentice ("Starkiller") looking a little older and a little meaner, but no robo-appendages.
Maybe the Emperor Cloned him? (that's sort of a joke)