That's not true. There are currently three pieces of DLC in the store: the Arilou, Chenjesu, and Mowlings each include a wallpaper, concept art, and music track. The issue is that it seems to only be available for Steam purchasers, which is a letdown for those of us that used GOG to purchase the game.

Well no, the DLC content currently available in the store is not available in the launch product. Nowhere do I find an "extras" folder with the music tracks, concept art, or wallpapers. Validation via Steam account doesn't work if you bought the game via GOG, as you get this error: "Sorry but ownership could not be verified. Please check that you logged in with the correct steam account, try again."