I really don't understand why the cgi on cyborg's body isn't immaculate. they did full cg armors for Zod and co in MOS and those looked beyond flawless.
Zods CGI suit in MoS was really very good
Cyborg however looks horebdous

Cyborg looks terrible. But I'm hoping he somehow evolves into a less fluid and more standard metallic suit. Maybe he's still learning control.
Still I loved the Avengers even though I thought Caps suit was terrible and now after a few movies he has the best costume of the group. Hoping for the same here.
Pray to god Cyborg has a breakout performance because that suit aint gonna win him any fans.
There is not a lot in the trailer on Victor as a character. I didn't get to much of a sense of what he's going to be like as compared to Aquaman or Flash. It naturally leads to wondering exactly what the take will be? Heavy on the pathos, a man who had the life he expected taken from him? Someone who embraces his new role? Is he out for vengeance against Apokalips for his father?
In relation to your questions, all the above. Plus if this borrows from JL:War in terms of Victor's unresolved issues with Silas: such as Silas believing metahumans make human athletes obsolete. Then this could provide some interesting drama. Particularly if Silas is killed and Victor never gets to reconcile his differences. Although I really hope he isn't killed off like they did with Emil Hamilton and Zod for instance.
I still think Cyborg should be part of the Titans instead of JL. I hope by the final trailer that the cgi is fixed because wooow, I didn't like how the suit looked at all.