Here we have the brand new Justice League trailer that was recently released at the Warner Bros. movie panel during San Diego Comic Con 2017.
It's nice to finally have a good look at JK Simons's Commissioner Gordon. I liked it. Steppenwolf's face wasn't shown but I saw enough to reaffirm my theory that whom I saw at the end of the extended edition of BvS was Mantis. Aquaman seems to be the one having the most fun in the movie. Who is the mysterious figure making the glass of water shake? I say it's Darkseid.