Gearbox Software's vice president of marketing Steve Gibson told DS that the demo will be available outside of the Borderlands: Game Of The Year package released this later month.
"The demo is going to go out to everybody, yeah," Gibson said. "When we put Borderlands out this wasn't even possible to do or contemplate. So that's kind of difficult, but yeah, the demo is coming out for everybody.
"The feeling is that we want people to feel that it's real. We want people to know that 'holy crap, they're actually making plans.' It's kind of like, Borderlands: Game Of The Year is great and by the way, these guys are also working on this, and it is real, and we're trying to get that association, that proof.
"These guys are making concrete plans, they're are putting stuff in a box already with Duke's face on it. It's actually like a certificate, and you'll see that it's like 'In Duke We Trust'. It's fun. We're thrilled to death."
Gibson said the demo will arrive before the game's release and will be different to what was shown at PAX and at recent press events.
"We want to - I don't want to spoil the surprise - but I think it's going to be fun and people are going to be surprised at what we put in there and what happens with it."
It was added that Gearbox will "come back and show [the press] multiplayer" during an event coming soon.
Duke Nukem Forever will be released on Xbox 360, PlayStation 3 and PC in 2011.