Other changes include the addition of new gestures to make navigating an Android Wear timepiece easier. Flicking your wrist will allow you to scroll up and down your card stream. Certain gestures will allow you to expand a particular card, bring up your apps and return to the watch face. The update will also allow users to send messages using a voice command. Certain messaging apps like Google Hangouts, Nextplus, Telegram, Viber, WeChat, and WhatsApp will support this new feature. You will be able to say, “OK Google, Send a WhatsApp message to Charlene: The Panthers will win the Stanley Cup."
The update will be sent out over the next few weeks, so be on the lookout for it
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source: Android via AndroidCentral