An aura of invincibility and a huge physical presence. Also, a bit of mystery. I didn’t really get any of those from the trailer. It looks like a standard James Gunn fare.
He's had stories where hes lost his powers and hes still Superman. He's also revealed his identity before so that takes away from the mystery.
Superman is more a story of an alien, who through being raised by good humans is able to represent the best of humanity with his actions. He inspires hope due to his combination of humanity, morality and the powers he has that allow him to survive where others might be a martyr.
This is what the Reeve movie portrayals had that the recent DC movies did not. The uplifting message of hope.
Its about his character as a person, beyond his powers. Not just his powers. Because if you just look at his powers and the action thats where it does become boring. If you take away elements of his personality and make him an edgy destroyer like some previous movies you lose who he is as a person and you infringe onto other characters who are already like that such as Black Adam.
His villains are also good at bringing out different aspects of his personality. Unfortunately we tend to get the same ones or some of the more boring ones in most movies. Zod at least highlights how his found family has nurtured him and that he isnt the same just because hes Kryptonian. Lex at least shows his humanity, despite not being the human of the two. Doomsday is a bit boring because it focuses on matching physicality and powers, but it does show what he's willing to do to protect his new planet.
Superman Vs. The Elite is one of my favourite stories and the animated movie version is really good. It shows why its important for him to be who he is and do things the way he does them, despite some people (and fans) wanting him to be more vigilante "justice" and doing what the criminals would do to him, back at them.