The fire temple song is very cool. It's really mysterious and I like the chanting in the background. Hope that's song will b in OoT 3DS!
if they took the chanting out in later versions of OoT (v1.1, v1.2) and changed the Mirror Shield in the MQ, i doubt they will go back to the original design for OoT 3DS. I wouldn't be surprised if they kept the new Fire Temple music and the new Mirror Shield design.