From Wikipedia:

"On June 5, 2007, Bethesda released the Fallout 3 Teaser trailer. The press kit released with the trailer indicates that Ron Perlman is on-board with the project, and cites a release date of Fall 2008. The trailer also features the Ink Spots song "I Don't Want To Set The World On Fire", which the previous Fallout developer Black Isle Studios originally intended to license for use in the first Fallout game. The trailer, which was completely done with in-engine assets, closed with Ron Perlman saying his trademark line as the narrator of the first three Fallout games: "War. War never changes."