Thor was merged with the human Donald Blake which tied him down to humanity (from what little I know about that character). Don't believe they're doing that for the movie though.
Quote:
Thor's father Odin decides his son needs to be taught humility and consequently places Thor (without memories of godhood) into the body and memories of an existing, partially disabled human: medical student Donald Blake. After becoming a doctor and on holiday in Norway, Blake witnesses the arrival of an alien scouting party. Blake flees into a cave and, after discovering Thor's disguised hammer Mjolnir and striking it against a rock, transforms into the Thunder God.
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And fan edited costume: