The announcement was made via the official boards where users who did not pirate the game asked: “The DLC seems to coincide with the release of the PC version of the base game. My question is simple: Will the DLC be available for the PC version?”
An admin simply replied: “I’m happy to inform you, it will arrive at the same time.”
However, there is still no word regarding the actual content of this upcoming free DLC pack for Batman: Arkham Asylum but I will certainly update you as soon as I will have some extra details.