Am 05. Juni soll die erste Download-Erweiterung "Forbidden Worlds" für Sins of a Solar Empire: Rebellion (ab 11,99€ bei kaufen) erscheinen (4,99 Dollar), dies hat Stardock bekannt gegeben. Das DLC-Paket soll vier neue Planetentypen, mehr Planeten-Boni und neue Research-Subjects mit sich bringen. Die größte Neuerung dürfte allerdings die planetare Spezialisierung (sozial oder industriell) sein.

• Four new planet types to colonize and exploit (Barren, Ferrus, Greenhouse, Oceanic), each created with beautiful high-res textures.
• New Planet Specialization System: Dedicate your worlds to either social or industrial output. Devoting your planet to social improvements will increase its population and culture, at the cost of trade income and ship production. Choosing an industrial path will limit your growth and culture, but make your planet a trading and ship building powerhouse.
• 15 new research subjects allow the races to conquer and expand onto the forbidden worlds.
• Discover 40 new planet bonuses during your exploration of the galaxy, unlocking the dark past of the Sins' universe.
• Unlock five new Steam Achievements and display your mastery of forbidden space!