LucasArts has shown off the Collector’s Edition of the game which will cost $20 more than the standard one.
What’s in it? Three exclusive game levels, character skins like that of Deak Starkiller, a lightsaber crystal [obviously], as well as a SteelBook. And there’s also a 2 GB USB flash drive which has other good stuff on it like a digital art book, a script, and wallpapers.
By the way, the Collector’s Edition is only for the Xbox 360 and PS3 versions of the game. The PC, DS, and Wii don’t look like they’ll get one.
Source: The Force Unleashed II Collector's Edition Revealed [Inc Gamers]