I replayed the final battle before I made that post to make sure that was it and it was.

Oh I believe ya, I just find it a rather odd choice for final boss music, let alone why they would use it in a trailer. I always think of 'Final Boss Music' as that sort of semi-sacred track that is one of the main climactic things you don't spoil before the game in advertising or anything :D

Anyone know which tracks are played in the US trailer?