This was circling around after comic con
Concept art: I am going to do a break down of the best concept that I can remember.
Aquaman:
I remember seeing two of pieces of art, one where he seems to swimming, hands forward, with a school of fish, another where he is underwater holding on to some sort of rock structure as schools of fish swim past him. Both of these were motion art. He might of had a trident in at least one of these and there might have been a third one of him as well. Hard to remember.
Wonder Woman: Concept art pretty much confirms her movie will be in some sort period setting or at least there will be a flashback to one. The main art I can remember is her standing on a huge heap of debris with shield and sword in hand after a battle with small flames on it as well and soldiers are standing on the ground around the heap. I have seen many people claim it is WWII but I am not so sure that it is. It is definitely seemed like one of the World Wars though. What was cool is after this art showed the next thing appeared was "Directed by Patty Jenkins"
Flash: I saw his costume and probably the one piece of concept
art I remember best. First it was a motion concept art again. We see Ezra with medium length black hair, like hair past his ears, holding either a bullet or a ring at a crime scene. Then his Flash speeds by. His costume is pretty different from the show. It is similar to injustice in the sense that he is wearing armor. It doesn't really look like that suit just has some similarities. His suit is more similar to Nolan's bat suit in the sense he has segmented armor pads on his suit and his cowl doesn't look it is made of leather either. It is not bulky but pretty streamlined. It was great.
Green Lanter Corps: I wasn't sure if this was concept art only
because it looked like the most comic booky. The other ones looked realistic to an extent while this one looked more like it was from a comic book. People they showed: Katma tui, Kilowog, Hal Jordan and John Stewart. My brother said he also saw Arisia too.
Cyborg, Shazam & Justice League: Really quick, I do not
remember seeing much Shazam concept art, I think I saw one of Black Adam and Shazam squaring off before battle, both of their costumes seemed New52 inspired, but it flashed by so quick man. Cyborg art and JL concept were dope but we didn't see much of either. The Cyborg concept art was the one same one from the JL art except him singled out. His costume his really hard to describe, it almost like the cyborg part of him was growing out of him, if that makes any sort of sense. The JL concept art was them standing around each other, similar to the Throne of Atlantis movie cover but with the the main 6 for sure, can't remember if GL was there or which one if was there if he was.
seems to be only description i could find