keeping it the same is not an option but making it completely different isn't as well. i'd say check some community interpretations on youtube like for example this one: www.youtube.com/watch?v=eG-TXvKiFR0 and you should get enough ideas on how to do it right.

If they elaborated on the renditions from the end of crisis core, this would be exactly what i would want to hear in the remake. Not completely different, but not orchestrated to sound like the midi either. https://www.youtube.com/watch?v=wjj2BdsgeRE

Hmm. They should keep all of the old songs and add in some new ones to spice things up.

If it's anything like what they did with FFX, I definitely won't like it. Possibly the only reason I still haven't bought FFX on PS3 is the horrible new soundtrack. Well not horrible but it sounds really unfitting and uninspired.

You realize that version of the song is a remake of the original? Not the "Remastered" in the song title.

Yeah, it'd be a bit jarring to hear this in a PS4 game.

https://www.youtube.com/watch?v=Hg3xlQDMzws&list=PLBC6E9C0EC45A8D09

Good but PSX quality is a bit off putting.