The first 30 seconds of the trailer are in the Fortress of Sollitude with Henry Cavill talking to Russell Crowe as Jor-El (wont go into detail here should be a huge qoute) but the consensus is that Clark Kent has just realised he is an alien and knows his powers but does not know why he was sent to Earth. Jor-El explains [it] to him to which Henry Cavill [Kal-El] determines he is ready to be what Earth needs and then a Superman S emblem crystal slowly rises up along with his suit (CGI cape - the trailer will show why) and he grabs both and then slowly walks out of the Fortress.

The remaning minute and 20ish seconds shows various action sequences, some repeated from trailer 2, however in more depth. You see around 5 more seconds of Zod and Superman flying down the skyscraper but you now see the huge aftermath of it, along with Superman saving a mum and toddler from a radio attenna which Zod has thrown at them.

Secondly, you will remember the boat Clark Kent is seen fishing on... Well there was more too that - after he reels in his catch a tidal wave is seen coming which knocks out all on the boat but Clark. [The wave] starts to overturn the boat, to which Clark (not as Superman) flies over and recalibrates the boat before dissapearing into the distance (I'm guessing this is what links to the Fortress of Solitude scene in the movie).

And finally, you all remembering seeing a cave in the movie with what was a huge CGI explosion, well you now see this from a different angle with both baby Clark, Jor-El and [Lara] in the background, and the explosion is slowed down a bit before [Kal-El] is sent to Earth.