Yea, I have been posting this kind of thread for a while since we had Pirates. I am very very certain that Stardock will in fact have a major expansion which 'expands' on the entire pirate faction. The GC III engine has endless possibilities on such things. I wonder if we can have a 'special' faction that is neither a minor nor a major but has the ability to trade, invade, and engage in diaglogue via the diplomacy window. Distant Worlds is a good example of how Pirates can be done and GCIII has an engine that FAR outlasses it in ability to do things.
My idea is certain to arrive the only factor is time. I predict it will show up in the next couple of years. If I knew how to write code I would tinker with it but I am not sure on how to test things.
Happy New Year!