I never thought I'd ever say this, but I think Aquaman might end up being my favorite Justice League character after seeing this movie.
I actually think Cyborg may turn out to be pretty well done. The new trailer looks like it may try to cram his full origin story along with whatever the main plot is - I'm just guessing this based on the brief shot of him playing football before becoming Cyborg. This would be very reminiscent of the plot in DC animated movie "Justice League: War" - the only difference being that Green Lantern was in the animated movie, and Aquaman wasn't. That movie might still be available on Netflix - I would really recommend watching it. It's not too long and I thought it was really entertaining.
The biggest thing I took away from this trailer - it actually looks fun! Characters are cracking jokes, and some are even smiling. I went and rewatched all the BvS trailers after watching the new JL trailer and the only joke that showed up in that movie was the "is she with you?" line when Wonder Woman first appears to help Batman and Superman fight Doomsday. The Flash has some jokes, Jason Momoa looks like he's having a blast, even Batman and Gordon have a little joke about playing nice with others. It's about time DC lightened up and made something a little more fun. I think they learned that with the early success of Suicide Squad that there is demand to see a less-serious DC movie, it just needs a solid story.