Sorry if this is covered elsewhere, but I love the idea of magic effects impacting the environment (even though I mainly play a Hunter/Ranged type character). But there were two instances in the trailer that seem to show this:

1. Obvious - the Push Shout in the cave knocks things off the shelf - nice touch.
2. This one I'm not sure about - at 5:57 in the new trailer when the dragon is sliding against the ground it LOOKS LIKE there is a patch of ground that is not snowy, but ICY. Could this be from the dragon's ice breath attack? Could his ice breath have frozen a bit of the ground or this just wishful thinking?