Re: How will a sense of danger be established for Superman?
I think they're already establishing that by having General Zod and other fellow Kryptonians for villains. There, you already have a conflict that is just as powerful as, or even stronger than Superman himself. That sense of danger is definitely going to be present, since we know and have seen briefly that Superman falls down on his knees and spits out blood.
"Soon, everyone in this city will know how it feels to live in my world.
A world without power. Without mercy. A world without Spider-Man.
They will see me for who I truly am. I'm Electro."