The first, second and third Injustice comic book covers have already been revealed and have release dates. Today Tom Taylor, the comic book writer who is writing for this comic tweeted an image of the cover for Injustice comic issue #4. Featuring Wonder Woman, Superman and Green Lantern going down in to the ocean... maybe after Aquaman? No release has been given yet, but you can guess it'll likely be April.
Source: TomTaylorMade
Source: TomTaylorMade