The photo is a a dark of shade of dark, with absolutely no color whatsoever (whether that's because Snyder, who claims to have taken the picture himself, shot the photo in black and white or is just giving us a taste of whatever extreme filter he plans on using in the film is yet to be known), which makes it hard to actually get a good look at the details of the suit.
"Lex Luthor is often considered the most notorious of Superman's rivals, his unsavory reputation preceding him since 1940," director Zach Snyder said in a statement. "What's great about Lex is that he exists beyond the confines of the stereotypical nefarious villain. He's a complicated and sophisticated character whose intellect, wealth and prominence position him as one of the few mortals able to challenge the incredible might of Superman. Having Jesse in the role allows us to explore that interesting dynamic, and also take the character in some new and unexpected directions."