A book with LOTS of NPC creatures and "animals" from around the Galaxy would be nice. But they are more likely to splash them in other books, as they have up to this point. And I guess that is what the NPC decks are for (and they are great....)
So I changed my mind. I want more NPC cards.
Adversary decks would be great. It's so nice to just thumb through a deck of cards and pull out what I need for an evening's session and have that right at hand. I'd also imagine it's profitable for them since they self print there's no middle man.