This was just a teaser trailer announcing Borderlands 2.
LAUNCH DATE TRAILER
This trailer detailed the official launch date for the game, as well as showed off a good amount of the game's features. The song in this trailed is called Doomsday by Nero.
COME AND GET ME TRAILER
This trailer is narrated by Handsome Jack, who is the game's main antagonist. He basically is egging the game's main characters on and saying they won't be able to take him down.
This trailer was released in time for the North American release of the game and features some new footage, including the first game's characters: Lillith, Mordecai, Brick & Roland interacting with the new characters.