Just a little tidbit. For those who are thinking "you cant run on ice!", it is possible it wasn't ice, it may have been a glass of some sort (which iirc happened in the movie with Entei, where the place turned into a glassy zone that wasn't ice or at least didn't behave like ice). That would explain how it's possible to run and land on it. Yeah, not the best explanation, but possible.
I still don't believe the map was real ice. It was obviously fake ice. And this doesn't lead me to believe the region is frozen over either. Rather, the trailers makes me thing there'll be an event which causes the region to be frozen, be that literally or in time or whatever. But not permanently. Hell, they could blame that on one form of Kyurem being "out of balance" with the other and the result is the region freezing or something stupid like that.
Also, Pirates are intimidating but stupid. The grunts just stood by as Arcanine completely destroyed Seviper, and Samurott was allowed to attack when the grunts had lots of time to recover from shock and counterattack.
That said, cool trailer. Only part I didn't like is Elesa's segment, which is sad because she was probably one of the better gym leaders in Unova for at least having something slightly unique (we've never had an Electric trainer with much style before, only strength (Surge) and depression (Volkner) about her. But the catwalk has taken her from unique to "eh, seen it before". I know she was a model even in BW1, but the catwalk just makes it too obvious. Get back to the Pokemon, damnit. I don't care about fashion in video games about fictional creatures which I can own. I want to see them fight and I want to see some Pokemon fainting. Not some fashion show.