I have found 15 screens on Blastmagazine.com from New Vegas! A bit disappointing as they look quite similar to FO3, some changes in scenery, building textures, clothing, etc.. not very surprising due to the fact that NV is run on the same engine as FO3. But i have to say the graphics look a bit smother and detailed, considering that these are from Xbox, and its not the final cut of the game so who knows...

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As these screenshots leaked onto the web, links to them have been removed.