Ok, I just watched probably every single trailer and video on the internet of this game and since the first video I've been hooked on the main song. Don't know what the name is yet but the singer/group's name is Dore with an umlaut over the o. Amazing mixture of old style Japanese singing and instruments, if anyone has any info this should be the place to post from now on.
Hopefully it will do better than the first as far as sales go, just for the sake of From Software bringing more of their games over here. On a more informative note, they added 5 extra characters besides Raikou, each with their own individual weapons. That in itself will make the game infinitely more replayable than the first one (The first one being infinitely replayable, heh).
A little update on the song: I went to this site and found some of the lyrics in someone's post. The lyrics go up to the part where the song becomes dramatic and are as follows: