The Joker will appear in a dream sequence, where he comes face-to-face with Ben Affleck‘s Batman. He looks a little different than he did in David Ayer’s Suicide Squad – his tattoos are gone he has a longer hairdo.
This is what Zack Snyder had to say about the Joker’s role in the film – and his DC Universe:
“The cool thing about the scene is that it’s Joker talking directly to Batman about Batman. It’s Joker analyzing Batman about who he is and what he is. That’s the thing I also felt like fans deserved from the DC Universe. That is to say, the Jared Leto Joker and the Ben Affleck Batman, they never really got together. It seemed uncool to me that we would make it all the way through this incarnation of Batman and Joker without seeing them come together.”
“The scene explains why Bruce had the Joker card taped to his gun that you see in Batman v Superman.”
“I’d always wanted to explore the death of Robin and if there ever was going to be a next movie, which, of course, there probably won’t be, I wanted to do a thing where in flashbacks we learn how Robin died, how Joker killed him and burned down Wayne Manor, and that whole thing that happened between he and Bruce.”
The director’s plan was to show “how they became like this … how he hurt him in a way that no one has, really. Other than losing his parents, it was probably the most significant personal injury to his life.”
Source: Vanity Fair