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I would love to have something that adds to Oddworld's lore/story/universe.
Like new species/plants, or perhaps a side story of sorts?
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This^.
But only in a subtle way. For example, the 1st secret area in the Scrabanian temple. This secret area has a sign in it that says "Secret Vault". Maybe in the background of this area, have Molluck inspecting it or something.
The thing I liked about secret areas in AO was that they stood out from where you were at the time. They also gave a much more intense feeling of difficulty and at times, would make you feel like you're not supposed to be there. Maybe add more to them so they bring more to the secrecy. Hints like pictures of Sam next to where one of the muds is working. Or maybe corpses of other creatures/busted machines like the shrink.
tl;dr, give secret areas much more depth to the secrets they can hold. Not just hidden muds.