Fallout: New Vegas - Coming this fall

Not exactly a sequel or expansion pack to Fallout 3, but it's still a Fallout game.

From the article: "Fallout New Vegas was announced by Bethesda last year. The game is being developed by Obsidian Entertainment, a studio comprised of many developers who worked on earlier Fallout games."

And will the gameplay feature pause-and-select-glowing-parts action? Probably not: "The trailer does not reveal anything about the gameplay, though Bethesda's head of marketing and communications, Pete Hines, told Kotaku last year that New Vegas would be a 'role-playing game experience'"