The first DLC pack for Sins of a Solar Empire: Rebellion, a standalone expansion in Stardock's 4X strategy series revolving around space colonization, will launch on June 5. "Forbidden Worlds" adds four new planet types to colonize, a new planet specialization system where you classify your worlds as either beacons of industry or society, 15 new research subjects, 40 new planetary bonuses and a handful of new achievements, all for $5.

Sins of a Solar Empire: Rebellion's "Forbidden Worlds" DLC will be available either directly through Stardock, or through other popular digital distribution channels such as Steam, GameStop, GamersGate and GameFly. CEO Brad Wardell confirmed last month, during the announcement of an investment fund to aid budding game developers, that Rebellion has been "immensely successful" for Stardock and that we should expect to see more Sins of a Solar Empire in the future.