http://cdn.zenimax.com/akqacms/files/tes/screenshots/CompositeMountain_wLegal.jpg
Though that looks like concept art to me.
Supposedly it's an in-game screenshot, and I recall that one thread about it on these forums had someone pointing out flaws in it that indicated it is, like low polygon counts in some places, the clouds being sprites, and such. And if it were concept art, it's of a completely different style from the other concept art, and looks to be a 3D rendered image rather than a hand-drawn 2D one, so I'm inclined to believe it's an actual screenshot, just a really good looking one.
http://screenshot.xf...107132944-4.jpg
http://screenshot.xf...106416713-4.jpg
http://screenshot.xf...105256524-4.jpg
It may not me snow but those textures are incredibly detailed, and they use Specular Occlusion.
I doubt we'll see that kind of detail on the Xbox 360 version, which is what all the screenshots we've seen so far have been from. Will the high-end textures on the PC version look that good? We'll see.
That too me is way less appealing then what i have seen of Skyrim.
It's not supposed to look appealing. That's S.T.A.L.K.E.R. you're looking at there, and seeing as the game is set in an irradiated and hostile location, I don't think "Ooh! Pretty!" was the kind of reaction that the designers were going for with the game's environments, on the other hand, Skyrim is likely to have a fair amount of that. But speaking purely in terms of the level of detail in its textures, it's certainly much better than anything we've seen of Skyrim to this point, and indeed, a lot of other games I've played, for that matter.
In terms of the design of its environments, S.T.A.L.K.E.R. has much more in common with Fallout than the Elder Scrolls, and as much as I like Fallout 3 and New Vegas, speaking purely in terms of graphical quality, those games have nothing on S.T.A.L.K.E.R. if you ask me. Fortunately, they don't need to beat it graphically because the gameplay and setting are quite different, and I enjoy both Fallout and S.T.A.L.K.E.R. for what they offer in that regard.
But back on the subject of Skyrim's environments, the game is definitely looking to be much more impressive in that regard than Oblivion. I've criticized some aspects of the game's graphics before (Like the water effects in the trailer.) but these are mostly because, to me, those things didn't look up to the technical standards I expected from the game. Speaking in terms of design, I've been impressed by much of what I've seen.
I doubt we'll see the game's environment change except as a result of scripted in-game events (Such as say, a town getting destroyed by a dragon as part of the main storyline.) and really, I'm fine with that. After Bethesda goes to great lengths to craft such an impressive looking world, all by hand, as we've been told, I don't want it to possibly be ruined by changes that occur over the course of the game. Besides, I doubt that enough in-game time will pass for most players to really see any major changes in the landscape beyond ones that happen as a direct result of events that take place in the game, like buildings getting destroyed or built as a part of quests (Seeing as it's rather unrealistic to expect such things to happen as part of non-scripted events in a game like Skyrim.) then again, we might see some trees getting chopped down as a result of woodcutting, but removing a tree that gets chopped down and replacing it with a stump probably isn't that hard to program, and I think that's how it will likely be handled.