Seems as though the Joker has been revealed via that of some images taken of Leto on the street. You can see in the images below Leto was showing a friend the picture of himself as The Joker. It appears as if they are going for the Dark Knight Returns style of Joker based on the suit he is wearing in the images. Pictures come to us via that of Twitter!

@ColliderNews @DCComicsMexFans @JaredLeto as The Joker! #SuicideSquad @BatmanvSuperman @Batman #FollowMe pic.twitter.com/aSTMd9kkMI

— Alex Guajardo (@Alex_GUAX) April 20, 2015