Telltale games announced on the VGX Live tonight (I'm watching it so you don't have to) that they are working on a new game series set in the Borderlands world called Tales from the Borderlands.
There aren't a lot of details at the moment but you will not be playing a vault hunter in the game and the game will be the traditional Telltale adventure game. The game will feature new characters created by Telltale as well as some returning characters from Borderlands 2. That's about all of the info we have on the game right now but expect more details next year.