I think it's been officially shot down by a developer (though I don't remember where the post is).  I'd love to see moons, too, but it'll have to wait for Sins 2.

It is interesting to see if they do it, although I doubt till Sins 2.

Well, you can say the asteroids that currently orbit each planet now can also be called moons, so replace each moon with a moon type, each with a bonus of sorts.

The problems with moons is that the develops will have to drastically overhaul the path finding. As it is, ships don't move smoothly, moons just adds to the problem.