I do not know what the plans are for release in the States, actually, though I don't see why not.
The music in the trailer is NOT from the score, and in fact, is not the style of the music for the film. The score is heavily thematic, "epic orchestral" with many different colors of percussion, orchestra, choir, etc.- some colors are savage and brutal, some triumphant and heroic, some nearly quasi-religious. When you have a film with such big things happening in it, the score has be to able to support the full range of drama, and when you have so many characters and locations, etc., strong themes help to both identify and unify what's going on.
_Mike