Well, Midway may have just met big daddy Warner Bros. VG247.com has the article about the rumor.
Let's take a look at the implications if this goes through: Midway owns Mortal Kombat and released Mortal Kombat vs DC Universe recently. Warner Bros, at last check, owns DC Comics (as evidenced at the bottom of DC Universe they still do). Now if Warner Brothers owns Midway, we might be able to see some DLC content for MK vs DCU! Of course they would probably screw it up with DLC like Bugs Bunny or Elmer Fudd instead.