That poll lacks some more options... like "I don't know which one is more interesting." or "Others". I cannot choose just now because it's too soon to be sure of what can be really more interesting for me as player.
-Special world environments: that's very nice and a great addition.
-Asteroid fields that can be mined, armed: not sure, i have read about it and seen a screenshot but... doesn't seem of the most interesting things to me (yet).
-New ship parts, hulls, better graphics: yes! As long as those new graphics doesn't affect users with lower end videocards, right? Not that i'm one of those. It would be nic if each civilization had a different hull style. I know it's a lot of work (and expensive) but it would be cool.
-Epic Generator (finished game exported as a story):
one of the best ideas. Unfortunately, it won't be so easy and i think that the result won't satisfy everybody. I suppose it'll be based on predefined texts (with placeholders for names and such) that will record events, some GNN news/reports... I think this idea has a great potential but i don't want to let my imagination fly with it. The results will never be like the human writting it (and people should understand that too). When you are in the beta, make sure you post an example so people can judge and hint.
-Spies: i hate spies.

Surelly i'll spend most of my time using them just for protection.

But it's a good idea considering how plain the actual system is.
-User-Designed opponents: Yay! Snathi, here we come!
-More detailed AI options (set int/bonus/etc.): a very good idea indeed. I'll love using this option.
-Playing as the bad guys in the campaign: Evil/bad guys are overrated. I don't really care about it although i'll play the campaign and hope to find some of the classical Stardockian humor in it.
I suppose that i'm between Epic Generator and More AI options. In the long term, More AI options is the best.
From the previous users, i like the idea of being able to create ships out of the game. One of the reasons why i don't spend too much type making cool ships is because when i'm playing, i tend to focus on other things. But it would be nice to be able to create ships when i'm not in the mood for another conquest.
Drengin UI???? NAH! I want an Altarian UI! Pretty pretty please! One UI for civilization would be cool but... time consuming to do and all that stuff. So i suppose i'll just support that idea previously mentioned of a UI for each aligment. It won't be the same but it won't cost Stardock so much, right?
Some kind of Highscre screen would be nice. I use Metaverse for that (although i know that with time, the scores lose points

).
By the way, could we have a screen were we see the avatar we are using in the game? I know it's a unimportant petition but sometimes i wish i could see my avatar somewhere.
Before i forget it as usual i'll use this post to ask this: official map editor? (with campaign creator, mind you) I miss this option but i can understand that it won't be done.
For now, i'm done. Keep the good work and bring us a wonderful Dark Avatar.