How can you say it "looks" legit? I have my doubts only because it's not on the official Eidos Montreal website. No updates about it, nothing. You also can't give us a link to your source and you said it came from some "art" site where no doubt, people know how to create fakes. This wouldn't be that hard.
I'm not trying to ruin peoples faith, I'm trying to eliminate false hope. I for one, don't want info on DX3 only to realize the info we were given was false 6 months later. At this time, this concept art is just speculation and rumour. And until Eidos confirm or deny it's truth, we'll never know.
EDIT: Since you wouldn't state a source, I went out and searched for myself. It seems, we may have a winner here. Zeitgeist, it seems you may've stumbled upon some real concept art.
Source(s):
http://www.rockpapershotgun.com/?p=1482
http://www.gamebanshee.com/news/static/ ... AwEiTP.php
Blood is thicker than water and sweeter than candy.