New Vegas will be an RPG in the style of Fallout 3, Bethesda noted, but the company did not confirm if it uses the same engine. The studio also stressed that it came up with the idea for New Vegas internally and then pitched it to Obsidian, not the other way around.

"It is not a sequel to Fallout 3," said Bethesda marketing VP Pete Hines. "It was just a great opportunity we thought to work with some guys who very clearly know Fallout--Feargus [Urquhart] and those guys were there in the early days of Fallout."