They trailer seems to imply that we'll get some sort of explanation for the obvious problems of "magic" in the Marvel Universe - this notion that there are indeed god-like realms parallel or just floating above. Really, Thor is one of the more fantastical heroes in Marvel canon, so I was pretty skeptical when they announced that they were going to ground him in the same reality as the Iron Man movies so that they can eventually pump out an Avengers movie.
If you stayed after the credits in Iron Man 2, you were treated to this scene already:
Sorry, that is actually the best quality out there (you get the idea though).
Real trailer - ahoy!