Source: http://www.engadget.com/2016/02/04/android-wear-update-gestures-voice-messages/
Since Android Wear's debut, Google has regularly added new features for the wearable software. Today, those gadgets are getting three more tools -- the stuff we first heard about back in November. First, Android Wear is adding new gestures for navigation through what's on your smartwatch. You can push, lift or shake your wrist to peruse cards, pull up a list of apps or return to the home screen. If you're not exactly sure how the movements work, you can get a tutorial on your Android Wear device from the Settings menu.
Android Wear already allows you to search or control music with your voice. Now, you can use those voice controls to send messages. Apps like Google Hangouts, Nextplus, Telegram, Viber, WeChat, and WhatsApp will all accept your spoken cues, so you won't have to pull out your phone to text someone. For example, saying "OK Google, Send a Hangouts message to Edgar: Does 5PM work?" will employ the voice feature to complete the task.
Lastly, if you happen to have an Android Wear device with a built-in speaker, like the Huawei Watch and ASUS ZenWatch 2, you can take calls and listen to messages on your wrist. Of course, you'll be doing so in a speakerphone-like scenario, so you'll want to be sure you have some privacy. All of these features are rolling out "over the next few weeks," which means you'll be able to take advantage soon enough.
Source: Google