FFIV from what I noticed isn't that much different storyline wise, Graphics wise... they pretty much just amped some things up to how FFVI was when it came out, so I don't think they can do to much with FFVI graphic wise. xD In FFIV though I did notice, and this prolly sounds -extremely- music nerd-ish, but.. The music was patched differently and pretty much I think the Trumpet patch was better the original way. Think of the battle theme for FFI DoS and use that trumpet sound for everything in FFIV. o o;

On the subject of change though... I'll cry if they change it to a point where they mess the greatness of the game up. =[ (AKA.. Don't change story line or anything >=[)