https://www.universfreebox.com/article/50014/Interview-Univers-Freebox-Yan-Liu-de-Xiaomi-France-annonce-un-smartphone-700-MHz-exclusif-aux-abonnes-Free-Mobile
it's in french so if you need translation just do it from the web :)
i don't see how it's possible, xiaomi won't release a new redmi...