After a number of rumors suggesting Gearbox was working on a new character for Borderlands 2, they finally teased the character during a SXSW panel.
This came in the form of a brief trailer, which suggests the new character is some sort of experiment and the interactions imply the character will be melee centric. This would make a lot of sense, since a pure melee class would be a welcomed addition to Borderlands 2 or even another hybrid character like Zer0 would be a welcomed change.
Unfortunately no further information was given, but according to Joystiq, the character is confirmed to excluded from the season pass. With that being said, this COULD be a hint as to what the final DLC pack will cover, since it would give the character some backstory / make sense to release them together. Make sure to stay tuned to JustPushStart for more information as it arises.