The community over at NeoGAF may have discovered what appears to be either removed content or a sneak peak at potential DLC for http://www.trueachievements.com/Force-Unleashed-II-xbox....htm
In short, some of the files embedded in the PC version of the game indicate that Starkiller may be on his way to Endor where he would fight Ewoks, Han, Chewie, Leia, and an AT-AT. This is in addition to the standard fodder of new saber crystals, costumes, and challenges.
With the support that LucasArts
gave to http://www.trueachievements.com/The-Force-Unleashed-xbo....htm
it wouldn't surprise many people to find out that they've planned some DLC for the sequel. The only question might be in terms of quality and consistency since Haden Blackman (the project lead for both games) is no longer with LucasArts.