Until an Imperial sourcebook comes out, I just would have used the same Duty sheet in the book but slant it for the Imperials instead. I think all the same careers work, just keep in mind the sensibilities of the Empire when creating characters.

I'm just getting into the gaming system (and RPGs in general) and I would also be interested in an eventual Imperial sourcebook, since I like playing as the Empire. If I'm GM'ing, then I like having that resource to put scenarios together to pit against my rebel player party. The WEG Imperial source book is nice but obviously outdated.