From the preview:
The character card is one of the most essential parts of the Batman Miniature Game. Different versions of each character appear differely on their cards so as to mimic their background stories. You'll easily be able to tell if you're facing the Batman from the Arkham Knight video game or from the Animated Series!
For the comfort of our players, cards have been changed to a standardized 2.5” by 3.5”, a format frequently used in board games and miniature games.