Ok, this might be a stretch, but Batman Vs Superman cinematographer Larry Fong Instagrammed this photo from the set of the upcoming film:
The interwebs has run scatter-shot with this, speculating wildly about whether or not this indicates the Joker is a villain in the film. To me it seems like this is probably just something he was proud of, throwing a card and being surprised he got it to stick into the foam. But that doesn’t make good Twitter drama.
I could see the Joker being in the film if they wanted to emphasize the crossing over of the two Rouges Galleries, but it seems a little soon after Heath Ledger left us, on top of the fact that they’ve announced a build up to the Clown Prince of Crime in FOX’s Gotham.