PC Gamer has word from the Nerdist Podcast where Gearbox Software president Randy Pitchford mentions they are "building an original IP for the next generation that we’ll announce sometime later." He also dispels the notion that there will be no more DLC for Borderlands 2 with the season pass fulfilled. Au contraire, says. Well, he didn't say exactly that, he said this:

"Everyone has this expectation that those would be the four DLCs and then that’s it," Pitchford said. "We’re going to do more. We’re going to do some other things. We don’t have details yet about it exactly."

"We’ve got more stuff in the hopper that we’re planning and that we’re getting pretty excited about. So if you are a Borderlands fan, you don’t have to be afraid that that’s the end of it."