I have seen the first pic before.(heard was fake)
The second one is new, and i hope it looks that good.
The 1st photo is a definite fake, if you take a look around the screenshot, there is zero jagged lines and I have never seen AA progress that far without crashes, hangs, and driver issues unless if it were previewed on a developer's rackmount at an Expo, and Valve has never previewed anything of EP3 in any event. Also, look at the curve of the crowbar, there is a white, pixelated, slim piece that are leftovers from a background cut-out. It is just copy and paste. Besides, is this supposed to take place in the Arctic? As for the second one, however, I have never seen that screenshot before. It seems more modern with the game interface now, so I can't judge it. Everything in the screenshots has very similar detail traits to other games powered by the Source engine. Plus, if you look at those windows on the right, frost is on them. I dunno if this is real, fake, concept, or level design however I think this just might be it.