Hi there! Stardock is working on 3 new games. Two small ones (Siege of Centauri and an unannounced new I Even) and a big strategy game that isn’t announced.
As for a Sins of a Solar Empire II, while Stardock helped develop Sins: Rebellion, our friends and partners at Ironclad own Sins of a Solar Empire and only they can make the sequel. We did just release a new DLC for it.
I think anyone who likes Sins or GalCiv will be very happy with the new game we are working in, 
