Higher framerate and loading times for a native PS5 port. Unlocked frames and VRR for PS5 Pro... no brainer...
you actually think the engine can run above 60fps without breaking the game in some way?
if you do you clearly don't know how games back then (especially japanese ones) were developed.
even RE4, whose code was adjusted for the newer HD releases to run at 60fps, still has multiple issues due to the framerate increase, because the game logic was originally coupled to the framerate.
on top of that the loading times will probably be shorter than the fade-out/fade-in transition animations are... because that was already basically the case on PS2.
so loading times will be basically not even a thing even when playing on a base PS4
this will run at 4k 60fps locked with no load times (outside of transition animations) on PS4 Pro and One X.
and for a simple remaster like this they would never go in and reprogram parts of the game to decouple the engine tick rate from the framerate either.