With over 500 million active users, WhatsApp probably has more than a few customers sporting Android Wear. Starting today, those folks will be able to read and reply to messages directly from their wrist. The new features are launching somewhat quietly though -- the App's Google Play listing hasn't been updated yet, and the direct link on WhatsApp's website makes no mention of the smartwatch features -- but users who update manually will find a new app installed on their Google Wear device. It's more than a simple notification push, too: users can read stacked conversation messages and even reply to them using voice. The update will probably hit Google's servers soon, but if you can't wait you can grab the official download right here.