This just got a PS5 version/patch. I dusted off my PS4 version and reinstalled/updated it. Not sure if I actually have the PS5 version now. The controller is vibrating when you fire which is a huge improvement, and indicates that I probably do have the enhanced version patched-in. Least I hope so. I wish it was clearer (like had a new title screen or something). The visuals seem a bit better than I remember, but it's been a while. They might be a lot better.
Anyway, bumping this since there's a good reason to give it another play now. I'm speedrunning it tonight myself. They also added a new stage where you play as a Terminator. Not sure if it's part of the campaign or a DLC you select or what.