My first post was a comprehensive 5-step plan on how to achieve world peace, solve famine, produce cheap efficient energy, reverse the exploitation of the environment, and make the members of the opposite sex irresistably attracted towards me.
Look how far that got me. Welcome to the Internet.
As far as I know, the game developers are working on a Sins Add-On, and that should have a campaign. Will it be any good? Who knows, time will tell.
I definitely hope that there should be a Sins 2, or at least more games in a similar vein that take the Sins model a lot farther. I seriously doubted that it would be possible to make a real-time 4X game that would be entertaining. I was wrong, although I wouldn't think of Sins as the best game I've ever played, either. I sure would like to see what would top Sins in this new genre.