Going back to Superman's origins, the Man of Steel trailer showcases some of the film's talent, such as Russell Crowe as Superman's alien father, Kevin Costner and Diane Lane as the Kents who find and raise him, and of course Henry Cavill as the superhero himself. Amy Adams as Lois Lane is shown at the end of the trailer.
Clark Kent is shown as a child having to guard his secret powers, and he's faced with the choice of saving innocent lives and revealing his true nature, or doing nothing and suffering with the knowledge that he could have saved them. His father tells him that he needs to decide what kind of man he wants to grow up to be, but no matter what, he will change the world.
The film's tone appears to be much more grounded and grittier than previous incarnations. Some might argue that a hero such as Superman doesn't need to be dark, however a character as powerful, as utterly indestructible as his needs some kind of a challenge.