A second full trailer for Thor has been submitted and approved for exhibition on films rated PG or greater, by the Alberta Film Classification Board.
By Canadian regulations, this rating dictates that the trailer would be attatched to a film of a similar rating level, and no lower.
What this suggests is that we may get this 2 minute, 22 second trailer sooner, on a film like "I Am Number Four", rather than later on a cartoon like "Rango".