The Gods Among Us want you to use the exclusive Fight Stick.
http://www.nintendoworldreport.com/news/32988
Injustice: Gods Among Us is being released in North America on April 16, 2013.
Along with the release date comes the news of a special Battle Edition, limited to GameStops and EB Games across the US and Canada. For $149.99 buyers will receive the game along with exclusive skins based on DC Comics: The New 52 Batman, Superman, and Wonder Woman.
Also included in the Battle Edition is a DC Comics themed Fight Stick. It has offical artwork from the game, a non-skid foam underside, adjustable illumination for buttons and joy stick, and lock-out feature for multiple buttons including Start and Select.
Injustice: Gods Among Us is being developed by NetherRealm Studios, developer of the recent Mortal Kombat reboot.