Anthony Burch, a Borderlands writer, leaked the title for the next downloadable content for Borderlands 2. This is the picture he tweeted, which has now been removed. It shows a poster with the title of next Borderlands 2 DLC, "Tiny Tina’s Assault on Dragon Keep.”

 
Gearbox has since confirmed that yes, this is the new DLC. Gearbox did show off Tiny Tina when teasing something for Borderlands 2 at the PAX East conference which took place back in March, so maybe we should have expected this.

When we hear more we will pass it on. At least we know the title and character now.

Source Ubergizmo