There has been no trailer for the console per se. But there has been trailers for some PS4 games. For example, Watch Dogs, Driveclub, Deep Down, Beyond Good and Evil 2, The Witcher 3, Star Wars 1313, inFamous Second Son, Knack, Destiny, Diablo III, Thief4, Killzone: Shadowfall, The Witness and Assassin's Creed IV.
Source: www.ps4playstation4.com/ps4-games-coming-soon-trailers