WhatsApp users are getting better media previews on iPhone
Basically, if you're using an iPhone, you should get larger images in WhatsApp. Up until now, you would get small pictures in the form of a square that wouldn't show that much, so you would have to open it to actually see what's in them.
Anyway, another interesting change involves the very useful Disappearing Messages feature. Thanks to the latest update, iPhone users in a group chat can now change the Disappearing Messages setting by default. However, admins will continue to have control by changing the “Edit Group Info” setting.
Not much else has been included in the update, so make sure to download it via the App Store to get all the good stuff mentioned above. The Android version of WhatsApp doesn't seem to have received similar improvements, probably because it's one of the best Android apps (sarcasm).