Generally, If an mobile application or software update had launched first this will be updated to only the Apple iPhone users.
This time WhatsApp brings an new feature to all the Apple iOS users. That is, Now you can play YouTube videos in WhatsApp it self without launching the YouTube.
When someone sends an YouTube link to watch an video you can watch there it self with out launching the YouTube video. And also you can chat. Previously, If any one sends an YouTube video link we need to launch the YouTube application.