After watching the trailer again I had a thought. In the begining where we see the land from a dragon's perspective, do you think that this could potentially be a dragon shout in action. It would be helpful when trying to avoid a dragon as it would show you what the closet dragon to you is currently seeing but as a possible downfall the dragon you see would know that the dragonborn is near.
What do you think, is this possibly one of the shouts or just the dreams of a Skyrim obsessed mind?