Yes, it's here. Bethesda have released the first teaser trailer for Fallout: New Vegas which is scheduled for release on PC, PS3 and Xbox 360 in October this year. You can watch the trailer here on Game-Debate.
A statement from Bethesda says "Fallout: New Vegas, the follow-up to Fallout 3 - the 2008 Game of the Year - brings this beloved franchise to a location only Fallout could do justice: Vegas. Fallout: New Vegas takes all the action, humor, and post-apocalyptic grime and grit of this legendary series, and raises the stakes"Awesome.
(Originally written for Game-Debate)