The developers of Millennia have posted their second community Q&A. This Q&A was run while the demo was active (still is for another 2 days!), so some interesting in-depth questions were asked. If you want to know more about the space race or a more culturally tied winning condition, religions, their differences, and many other things, then check out this thread.
An excerpt:
Can we rename heroes and can we reshape and change their stories to be different from how they were in real life mythologies and legends?
You can rename your army stacks, but not individual units. When you get a Hero, you can send them on any Quest they meet the requirements for, so if you want to try to tell their story, or any variant of that, you can try your best!