Borderlands 2 DLC Incoming
The DLC details:
A sixth playable character, the Psycho called 'Krieg' will be available in May
If you want to level up to level 61 then you can buy the DLC released on April 2nd, which will also add a new weapons tier called Pearlescent, the rarest in the game.
Also released that day will be a free piece of DLC that adds Ultimate Vault Hunter mode, playable by any one who has beaten True Vault Hunter mode and reached level 50.