mentioned on the V's Fix Github, it's just a matter of someone being able to implement the content - details below: https://github.com/VFansss/mgs2-v-s-fix/issues/137
"[i]I have a repo open for this project already, however we have a hurdle to clear before we can even really bring the hi-res textures over. The engine has a lot of limitations inherited from the Xbox conversion. There is a limit to how many assets can be in active memory for each stage (everything is a stage, from the main menu, to the cutscenes, to the actual playable stages themselves), and the game streams in new assets as it needs them.
There is, from what I can see, about a 16MB limit on textures, audio and models. We can change the textures out with anything we want (to a degree, resolution has some nuance), however we quickly exceed that 16MB limit due to the DXT5 textures. It doesn't compress alpha that well, so we get very large texture sizes.
We can truncate textures in a similar way to how the original textures were done, so a 10242048 texture may only actually use 10241152 of that size, the rest being blank. We can truncate the remaining height (I believe it's intervals of 24px) to shave some size down, but to get anything really usable, we have to overcome the size limitations someway.
I can see using LUA to intercept the texture calls and storing the new textures elsewhere in RAM, kinda similar to some emulators with high res assets do. Another idea is to leave the game as it is for the most part, but where it stores the pointer for the texture, have that redirected to another point in RAM where our hi-res stuff is located at.
I'm not sure how familiar V is with doing stuff like this, or if nemesis2000 is even interested with it. It may be worth looking into how GTAIII/VC/SA handles their hi-res texture mods with their plugins, as the plugin system that is used here seems to be similar.
Tl;Dr, overcome the cap on how much all the assets can take in RAM, and it'll be relatively trivial to port or remake the textures in even higher quality (this is what is preventing me from finishing my repo).[/i]"