In addition to Batman, Superman, Wonder Woman and Aquaman, it's now confirmed Ezra Miller, the DCCU version of The Flash, will be featured in Dawn of Justice.
The DCEU Twitter feed reveals Ezra Miller told a fan that Barry Allen's hair will be kept longer for Batman Vs. Superman; his Flash suit is described as having a post-apocalyptic look to it, and Ezra hinted he will have more of a slender ripped physique rather than a bulky muscular look for The Flash.
Check out the tweet:
"Batman v Superman: Dawn of Justice" has a March 25, 2016 release starring Ben Affleck as Batman, Henry Cavill as Superman, Gal Gadot as Wonder Woman, Amy Adams as Lois Lane, Laurence Fishburne as Perry White, Diane Lane as Martha Kent, Jeremy Irons as Alfred, Jesse Eisenberg as Lex Luthor, Ray Fisher as Cyborg with Callan Mulvey, Holly Hunter as Senator Finch and Tao Okamoto as Mercy Graves. Justice League is to follow directed by Zack Snyder as well.
Fearing the actions of a god-like Super Hero left unchecked, Gotham City’s own formidable, forceful vigilante takes on Metropolis’s most revered, modern-day savior, while the world wrestles with what sort of hero it really needs. And with Batman and Superman at war with one another, a new threat quickly arises, putting mankind in greater danger than it’s ever known before.
Batman Vs. Superman Comic-Con Trailer: