gameranx.com has relayed some information gleaned from the official Skyrim forums, where a user has posted highlights from an preview of the game in the Official Xbox Magazine. Details include info on a couple of the new Dragonshout abilities in the game, one of which apparently slows down time, Matrix-style. Another interesting tid-bit is that creatures you stumble across while traversing the world, including dragons, won’t immediately give chase, unless you give them a reason to notice you.
The article contains spoilers on the storyline, but they are labelled and placed at the bottom, so you can safely read it up to that point.