Thread:Extension talk:VisualEditor/(When) will new features become available for MW1.23?/reply (5)

Theoretically there will be very few files touched in MW-core that would need back-porting; beyond the OOjs UI library and (new for MW 1.24) the Parsoid styling, it will come down to occasional API additions created to give VisualEditor missing functionality. We're not doing it because we don't have the time and it's not part of our focus, but it shouldn't be too hard, nominally.