Official word regarding a sequel..
Q: You've still got at least a year, but are you going to miss Hank Hill?
Judge: I don't know. It's hard to say. I probably will. There was a while when I didn't think I would miss Beavis and Butthead, but I kind of definitely miss doing that. And even though I'm not eager to sign up for more, there are times where I kind of go, "Oh, that was fun." It would be fun to do a little bit of that again. But I have done a little bit of it again and it happened with Hank. I think cartoon characters have a way of coming back from the dead all the time.
Q: Did they ask you to do more Beavis?
Judge: Yes, there's been a lot of interest in a sequel to the movie. And I did some stuff for the Video Music Awards last year, and we've got these DVDs coming out. So I've actually been looking at a lot of Beavis and Butthead lately for these DVD volumes.
Q: You would entertain, though, the idea of doing it again?
Judge: Yes, not a full-blown show again, but something with them would be fun.
From an interview with IGN a year and a half ago