I'd much rather Ironclad release another Sins game after these 3 mini-expansions in a stand-alone release with 2 brand new factions.
-That alien race the Vasari were running from could finally make an appearence.
-Maybe a sect of the advent that broke off from them hundreds of years ago that shows up and threaten both the Advent's way of thought and TEC's trader space.
With both the Advent, and the Vasari tied between the new races and the TEC things would get interesting. I hope Ironclad will set the stage by a great marketing campaign to be even more successful in this new game.
Maybe they could call it: Eclipse of a Solar Empire. Something sophisticated just like Sins of a Solar Empire.