If we talk about antonyms for the word "retro-versions," we are essentially discussing modern iterations or contemporary adaptations. Retro-versions refer to an older version of something, which is classic, old-fashioned, or outdated. So, antonyms could be modern, up-to-date, contemporary, trendy, or current. Retro-versions are a throwback to past times and evoke nostalgia, whereas modern versions are a reflection of current patterns and contemporary aesthetics. Furthermore, retro-versions mirror something designed or made at some point in the past, while a modern version is a new version made with the latest trends and technology. Therefore, antonyms for "retro-versions" can be a good way of expressing the contrast between old and new, the classic and the fresh.