They got 2-3 hours with the game, just like the latest GI and PC Gamer magazine previews. PC Gamer went to Riften. I'm sure we'll see and hear new stuff. Pete said this was the last demo wave before launch.
Oh, and remember, Pete said they played the same Alpha build from June that's been at all of the conventions. Don't freak out when a preview mentions a bug/glitch.