Oddworld Inhabitants released a post saying what improvements will be made in the future!
1 - better quality audio (audio is currently compressed, we'll fix that)
2 - integrating the newer sound effects from "Munch's Oddysee HD"
3 - default brightness and gamma tweaks to better match the original
4 - switching the movies back to their original aspect ratio (and thus bringing in black bars at the sides)
Seems like a good start
Personally I would like the camera axis inverting to be fixed? Like, by default its set to be inverted, so pressing right swings the camera left, etc. But if you turn this off, then the aiming for stuff like gun sligs and snoozers is inverted! So pressing left makes you aim right, its super annoying