You'd still need to write native packages in UE4 to:
- Load and execute unrealscript.
- Load vertex meshes and textures (unless all the content is ported).
- Load the maps.

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You'd still need to write native packages in UE4 to:
- Load and execute unrealscript.
- Load vertex meshes and textures (unless all the content is ported).
- Load the maps.
Also, I'll add that if I do ever get around to doing a port to UE4, I would probably write a converter for UnrealScript to Unreal.js (JavaScript) and use that as the base for everything, since UE4 doesn't officially support UnrealScript. JavaScript/Unreal.js is surprisingly close enough to UnrealScript that I think it would be feasible. It would also allow us to quickly reuse/repurpose all existing code/mods/etc., with some improvements of course, especially since JS is infinitely more flexible than UScript.
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Earlier this year I had successfully tested Unreal.js. It works beautifully.
https://github.com/ncsoft/Unreal.js
Damn son, The Kron Dog