I wish they would come out and say it's hush-hush: "No spoilers! Sorry!"
That'd be disappointing, but far less frustrating than silence.
I do know that there is the potential to help specific alien species grow or shrink depending on the actions you make
See, that's part of the problem: "the actions you make" is very non-specific.
I'm certain that the actions we take in dialogue, in quests--both main and side--will have a lot to do with the shape of the galaxy... but what about actions that are taken independently? Not a quest, not chatting with aliens...just going full-on Destructo-Mode™ against one empire or another...can that change the shape of the galaxy too?
It's little details like that which I'd really like to know...or be told I won't get to until the game is released and I try it. As opposed to this darn silence!