Updated with date and price.
Gearbox Software has seemingly inadvertently leaked the name of the final piece of planned Borderlands 2 downloadable content. Thanks to a now-deleted tweet that showed a banner, we can safely say it will be called "Tiny Tina's Assault on Dragon Keep."
Stealthy Box (via IGN) caught the tweet from lead writer Anthony Burch before it was taken down. At PAX East, Gearbox showed a teaser for the DLC, featuring Tiny Tina leading the vault hunters in a game of "Bunkers and Badasses," the Pandora version of a tabletop RPG. Suffice to say that the content could all take place in a fantasy world, but we're sure Gearbox will come up with some explanation to let you keep your loot.
Gearbox has announced that this final piece of content is due by the end of June. It will complete the four pieces included in the Season Pass, but the studio has already said its open to making more.
Update: "Tiny Tina's Assault on Dragon Keep" will launch on June 25 as the fourth pack included in the game's Season Pass, or for $10 (800 MSP) standalone, Gearbox confirmed to Joystiq.