The first image of Gal Gadot as Diana Prince aka Wonder Woman was revealed at the Comic-Con panel for Batman V Superman: Dawn of Justice. Wonder Woman will be a part of that film and then move on to a standalone (possibly origin) movie and Justice League.
Batman V Superman: Dawn of Justice stars Ben Affleck as Bruce Wayne/Batman, Henry Cavill as Clark Kent/Superman, Jesse Eisenberg as Lex Luthor, and Gadot as Diana Prince/Wonder Woman along with Amy Adams (Lois Lane) and Lawrence Fishburne (Perry White). Zack Snyder returns from Man of Steel to direct. Earlier this year the planned release date was pushed back to May 6, 2016.