Obsidian CEO Feargus Urquhart has told Joystiq that he considers Fallout: New Vegas to nearly be an original IP.
Speaking at Bethesda's pre-E3 event for American press in Las Vegas, Urquhart told the site it's a "different kind of licence".
"This is different than going off and making the Iron Man 2 game," he said.
"I mean this isn't a movie game. It's taking a license that, first off, we already love -- and a lot of us actually were involved in making the original Fallout games. So this is sort of just something fun to do.
"I mean literally, when I was at Interplay, a lot of the reasons why I didn't leave when I probably should have left before was so I could get to make another Fallout. And so I kind of look at New Vegas as a different kind of license."
Senior designer for New Vegas Chris Avellone told VG247 at the press event for European journalists last week that the game's been in development since the last piece of Fallout 3 DLC was released, also explaining how development on the spin-off began.
"Bethesda basically approached us and said, “Hey, do you wanna do another game in the Fallout universe? We have the western United States to deal with. Choose a location there, give us a pitch, tell us what you think would be exciting and then we’ll just see if we like it.
"And we were like, “OK. Well, here’s our pitch and here’s what we’re excited about it. “hat do you guys think?”. And they were like, “OK,” and then we just started. [laughs] It was pretty cool, I was like, OK, that’s awesome."
Just like Fallout 3, Bethesda does have plans for DLC for New Vegas.
Fallout: New Vegas releases this fall for PlayStation 3, Xbox 360 and PC.