If you put this epic music at 1.25 or 1.5, it will be much more epic and massive than it is in the original, going at 1.0 in time, who agree with me about the coolness of this song, going at 1.25 or 1.5 in general.
The theme from trailer seems modified slowed down version of Agni Kai theme from the original
'Promosm'
The way it ties into the main theme is really rewarding - awesome!
Thanks