One feature I'd love to see in the future is something that was a favourite of mine from Space Empires III: random race personalities and styles. While currently the Dregin are always aggressive, etc. in Space Empires III each alien race would have a random ship style, logo, tech preferences and personality. It meant that each game was different in a way Galactici Civilisations II doesn't quite match.
When I run into the Dregin I know how they're going to act based simply off previous games.
I'd like to see more of a mis-match style. Random logos and ship styles coupled with a random choice of AI personality (and the appropriate dialogue). Like the AI, you'd then no longer be in the position of knowing how they're going to react until you've spoken somewhat.