I prefer the music from the previous trailers, it had a more somber and yet hopeful feel to it. I really like the misunderstood hero characterization over the boy scout persona of the original Superman.
But how does Jor-El know that Kal-el will have super powers on Earth? I think that's kind of hokey. If the people of Krypton did know that the yellow sun gives their people super powers, why wouldn't they send out their kids to different worlds with yellow suns and have them conquer those worlds? Why would he care that Kal-el will be a savior/hero to humankind on this insignificant little rock of a planet?