Deus Ex 3 concept art has leaked onto the Internet. It’s only one piece of artwork depicting a pretty nondescript (though extremely detailed) high tech laboratory, but if you look closely you can gleam some details from the pic.
The image was posted on a deviant art page of a concept designer known as BaronTiERi.
While it is possible that this could be a fake, it is unlikely given that the artist has a quite extensive presence on the Internet. He also claims to have previously done concept art for Prince of Persia and Assassin’s Creed.