You called it. There is a general (though not universal) desire to transition to the standard containers and algorithms, but there would be a bunch of work needed to make that work, as well as concerns about fragmenting the codebase by mixing TContainer and std::container styles (and all the necessary interop code that comes with that). Specifically, there are no actual plans in place… at the moment it’s mostly regarded as a ‘UE5’ line of thinking.
I don’t think there’s any desire to support the entire standard library though (iostreams, locales etc.).
Steve