Diplomacy would be nice. As the Empire you could threaten to attack a neutral party if they didn't join. (Might not always work of course) Or you could persuade them as rebels.
I really want campaign to be turn based.
To a degree, I disagree with the empire having no covert. Probably not nearly as much as the Rebellion, and easier to uncover. But they had things that were done in secret. But I can see how it could be unbalanced.... hmmm...
I want a Homeworld type space battle system, but I don't think they are going to do that from the recent previews. Oh and Radius damage would be good too. (well for the larger ships)