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Take a look at what's registered on Steam:

Marauder Strike Suit
Weapons pack
Heroes of the Fleet
Korean version
Mod tool

Hopefully GOG will get the DLC system implemented soon, and I might even consider getting the lifetime DLC upgrade.
I bought the game just in time to get the special promotion of free dlc :D
Update: Raptor is available for purchase, and Marauder is in beta testing (or released already, who knows). Mod tool released just today.