A user on reddit posted the pics.
The scene featured what is thought to have been either an alternate universe Flash or a Flash from the future (or both) reaching out to Bruce Wayne to warn and tell him to form the Justice League.
"Bruce! Listen to me now! It's Lois! Lois Lane! She's the key! Am I too soon?! I'm too soon! You were right about him! You've always been right about him! Fear him! Find us bruce! You have to find us!"ï»¿
The Flash costume used in the scene seems to resemble The Flash from Injustice: Gods Among Us. Maybe Elseworlds, as well.
This also apparently won't be The Flash costume in Justice League as Zack Snyder previously teased a look (see below).
"Batman v Superman: Dawn of Justice" is directed by Zack Snyder 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.Â
Fearing the actions of a god-like Super Hero left unchecked, Gotham Cityâ€™s own formidable, forceful vigilante takes on Metropolisâ€™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 itâ€™s ever known before.