Well, it's definitely coming to the UK too, or at least according to the reports (the link below being one of them) I've heard. http://www.digitalspy.co.uk/gaming/news/a224683/force-unleashed-ii-ce-for-uk-release.html
As for when exactly we'll be able to pre-order it, as with the Fable III Collector's Edition (not sure if I'll even be able to afford both!), no idea as to a release date, though I know both standard editions of the game are set for release for the 29th October (2010, of course)... It better be soon!
There's been no more news since I replied to above, but when talking to a GAME employee last month about why their site didn't have the Fable III Collectors' Edition, he told me that they hadn't started "selling" it (as a pre-order) as they hadn't received their "confirmation code" from the publisher - in Fable's case, Microsoft Game Studios.
I'm guessing it's the same for any store, Amazon included, and for any game, including Star Wars: The Force Unleashed II (Collectors' Edition). Of course, it still brings us back to the initial question, but slightly changed - "When will Amazon, or GAME/Play/etc. receive the confirmation code from (in this case), LucasArts?", and to that question, the answer is the same. No idea.
Sorry I can't be of more help, but there's not much more anyone can do at the moment, at least as far as I know.