After organizing my thoughts on the matter... this is the conclusion I have come to.
Change is good, but change can also be very bad.
I understand that certain parts of the story may have to be reworked (Which, apparently doesn't pertain to cross-dressing Cloud
), various cutscenes have to be reimagined, the battle system etc. A decent amount of new stuff would have to be added as well, side quests, items, equipment, cutscenes etc. I just hope they don't go a little too crazy with it and COMPLETELY redo things that didn't need fixing.
The battle system is a good example of this. It's so simple, yet effective. Having a battle system like FFXIII (which I thought was kinda cool, aside from the only controlling Lightning part) may change things up a bit too much and may make it feel unfamiliar. God forbid if they try and make it an action RPG like Kingdom Hearts or FFXV, which I honestly would not put past them. Maybe like Dave said, some sort of option to switch? Best of both worlds?
The music would be the other thing that needs the most care. The original soundtrack is pretty much perfect and is (arguably) the best in the series and I don't think would benefit from re-arranging like FFX HD. Though, again, the solution to this would be able to choose between the classic one and the re-arranged one, which FFX HD PS4 has I'm fairly sure. Hell, even the DS version of FFIII has the option to change soundtracks...
And please.... stay away from the Chapter/Mission lay out of FFXIII. It didn't help that game. At all. And try and restrain yourselves when it comes to DLC.
Now, trying to be positive. I CAN'T WAIT TO SEE KNIGHTS OF THE ROUND AND SEPHIROTH'S SUPER NOVA IN GLORIOUS PS4 HD.
I'd also like to see some sort of Crisis Core prologue or unlockable... something. I'm playing through it for the first time now (At Mako Reactor 5 with Sephiroth) and am loving it. So seeing that game represented would be nice.
In summary, I WANT. REAL BAD. But and slightly skeptical, which is basically my stance on FFXV.