Loads of cool info in the trailer.
Parademons, sand cave Batman, etc. seems the most out of place thing in the trailer. Some say it's a dream sequence. I tend to believe it's set in the future, but it's possible that scene is canon to the happenings in the film. I'm not sure how Darkseid will fit into the film, as well as Doomsday and pre-bald Luthor, who appears to be wearing a wig, anyway.
There's still a lot of misdirection in the images we've been given. This is the essence of possibly the greatest Batman/Superman fight in Miller's comic, and it's clear they've taken liberties in expanding outward to apply it to the newly built universe.
All of the DC universe stuff is happening way faster than the Marvel universe did, with implications and story arcs being legitimized and processed in just two films, so it seems risky.
Honestly though, starting with a world ending Terra-forming machine that bring Wonder Woman out of the sky and Aquaman out if the ofean, as well as Booster Gold, Cyborg, and Flash coming to the rescue is really exciting.
There was no precedent for world-unfolding until Marvel did it. There may be a lot going on, but I am hoping it all works without feeling too taxing on my brain.