Other than a few characters, the casting for Ben Affleck's Batman solo film is still in the developing stages. While nothing is official, Affleck does seem to have a few choices in mind, including actress Sienna Miller.
Miller starred alongside Affleck in his recent film Live By Night, a film Affleck also directed. Miller has previously been associated with the Batman film by an off the cuff comment she once made to managing editor of Fandango Erik Davis, implying that she would love to play the part of Catwoman if she made it into the movie.
Nothing has come of that interest just yet, but Affleck was recently interviewed by HeyUGuys and was asked about Miller's involvement, specifically in the role of Vicki Vale. He said “She’s perfect for anything. She could do anything. Vicki Vale’s kind of bitchy, I think she’s better for…well, we won’t say that.”
He left off there, not confirming who he had in mind for the talented actress. Fans could draw a number of conclusions, but there are many who are hopeful that regardless of who plays her, Selina Kyle makes an appearance. The film is still largely in flux, and Affleck has previously noted that he will not push the film out until it's ready.
The film has no official release date or cast other than Affleck, Jeremy Irons (Alfred Pennyworth), and Joe Manganiello (Deathstroke), and it is being developed by Affleck and DC lore guru and Chief Creative Officer Geoff Johns.
Wonder Woman opens in theaters on June 2, 2017, followed by Justice League on November 17, 2017; Aquaman on July 27, 2018; Shazam on April 5, 2019; Justice League 2 on June 14, 2019; Cyborg on April 3, 2020; and Green Lantern Corps on July 24, 2020. The Flash, The Batman, Dark Universe and Man of Steel 2 are currently without release dates.