The Mechromancer class that has been recently teased by Gearbox is available for free to those who pre-order the game. But if you don’t feel the need to pre-order it, it will be available to EVERYONE October 16 for an extra 10 bucks.
On top of that, Gearbox CEO Randy Pitchford also announced that after the September 18 release of the game, they have 4 new DLC’s to add to the game! Each will be stand alone and not relevant to the story, and will cost an extra 10 bucks a piece. Alternatively, you can get a $30 season pass, which will allow you to obtain all 4 DLC’s.