This topic could go in any of the sub-forums but I decided to put it here:
I was thinking about this earlier. What would be my wishlist for non-career supplement books?
To head off the obvious I don't think an Imperial book is needed. You just make characters and play as Imperials if you feel the need for a bad guy campaign.
Alien Compendium: I'd like to see a book that is a compilation of the released races from the various splat books plus a lot of unseen races, all made ready to use for PCs.
Droid Catalog: I'd love to see a book focused on droids. Not just lots of example droids but also stuff for droid PCs, like maybe a way to use attachments and mods on droids. (Forgive me if this exists and I missed it, to my knowledge the work around is to buy armor/weapons and mod them but treat them as if they are integral to the droid.)
Adversary handbook: Sort of a monster manual but with expanded rules for creating memorable villains similar to the Inquisitor rules out of F&D plus the advancing villains stuff from the EotE GM Kit. Also, perhaps rules/guidelines for giving the bad guys their own memorable ships. Speaking of:
A ship book: A book with lots of ships, preferably with a few including deck plans plus compiled attachments or the ships. And if there's room a few example Outlaw Tech starports! I am hoping the eventual Smuggler book will be something like this!