Honestly? It's Vikings, dragons and rough, mountainous terrain. It might not be Icewind Dale, and Bethesda are going to want to probably make a few diversions from canon in order to ensure more variety, but from the look of the teaser, I'd find it hard to believe they're going to tread down the same path as with Oblivion and that Warp in the West "a wizard did it" bullshit. Bethesda are stubborn, but when overwhelming fan and press sentiment is "your world is boring", even they listen up - see Shivering Isles for an example of just that happening. Of course, whether they took the lesson to heart is another matter.