The preview starts with the same footage of Batman recruiting flash, then logos(including the new DC logo). we cut to a montage of the team. Bruce talking to Diana at some kind of museum. Cyborg looking depressed as he walks through the hall of a high school(apparently we see him use some kind of holographic projection to blend in) with voice over from Victor saying I never asked for this. I didnt want to be some thing.
We then see aquaman in atlantis(apparently resembles castle ruins), talking with Vulko(william dafoe) about his destiny. We see a motherbox being guarded by atlantian soldiers when out of nowhere theres an attack. Steppenwolf takes the motherbox, aquaman swims after him, steppenwolf throws his axe at aquaman & in slow motion arthur dodges it.
we cut to Batman, WW, Flash & Cyborg being overwhelmed by parademons in some kind of tunnel, the tunnel floods and Aquaman shows up to save the team. We get the dressed like a bat, I dig it then Aquaman asks Batman for help. We cut to the team entering the batcave as Flash geeks out. voice over from Batman about the parademons(referred to them as creatures) kidnapping scientists. WW asks whats the plan as Flash asks Alfred for some service, Alfred walks off.
Montage of action(slow mo shot of WW falling while trying to reach her sword as flash tips it with his finger so she can grab it, cyborg punches aquaman as aquaman throws him against the wall as the shot transitions into Aquaman throwing Bruce against the wall, aquaman ww & flash guarding what appears to be the scout ship, Batman gliding into a parademon, Steppenwolf stepping on WWs chest, Cyborg standing on a football field).
Flash then makes a joke about Cyborg looking like the tin man. After the JL title card we get the money shot. Batman is driving towards some kind of ship when Superman in the black suit,beard & mullet lands right in front of it, red eyes and an evil smirk(fire in the background, raining ash, great visual shot) while Batman has a look of oh shit as the trailer ends.
https://www.reddit.com/r/DCEUleaks/comments/6j4d73/jl_trailer_description/