Speaking at the Rezzed conference today, Pitchford asked fans to bug Sony to get behind it. "Perhaps some of you folks can convince Sony to start that," Pitchford said. "We're too busy to develop it ourselves. But I know there are a lot of talented developers who could take our code, our source and our content and perhaps create something like that."
Though Borderlands publisher 2K Games would seem like a more likely decision maker for a potential port, we could see Sony potentially being interested in putting such a popular game on its handheld, which could use some popular games.
Update: Reader Stewox points out that Gearbox owns the Borderlands IP, and thus is free to talk to, say, Sony instead of its current publisher of choice.