Yet still the announcements keep flowing. Joystiq reports that those purchasing the Extended Cut Blu-ray edition of Green Lantern will receive a Sinestro Corps themed character model for the PS3 version of Batman: Arkham City.
For those unsure of their Green Lantern lore, the Sinestro Corps are a group of rogues lead by ex-Green Lantern Corps member Sinestro. Seeing as the Sinestro Corps once attempted to recruit Batman to their ranks, the costume makes some canonical sense.
Unfortunately, if you want the costume you'll need to ensure you purchase your copy of the Green Lantern Blu-ray from Best-Buy, as the skin is a retailer exclusive.