They certainly look different... as much as I can tell from magazine scans. Some of the pictures look more like concept art than actual screen shots. I don't know if that's good or bad, or just a victim of the scans. I'm no photographical expert, but every time that I've tried to scan anything from a magazine, the results were always horribly grainy, washed out, color pixelated, or had some funky honeycomb pattern all over the place. So I'll take all the 'net scans I see with a grain of salt. I mean first of all, actual shots in a magazine are going to be dithered because of how color magazines are printed. Then you have someone scanning that, which further dilutes the quality untold amounts, depending on how they do it, and what they do it with. End result, low quality garbage. At least compared against a genuine screen capture directly from the game to your HD monitor
So I'll withhold judgment until some high-res captures hit GI's site, or Bethesda releases something. Like others have said, I already see many things and details that are head and shoulders above Oblivion. Screen shots are nice, but they still don't do any justice to a moving world. I'll be interested to see NPC animations, how snow falls, how flickering light dances, etc. The stuff that brings life to an otherwise static screen shot world.