WhatsApp update adds support for Android Wear
The features include stacked notifications, and message previews. You can respond to messages by voice, or by using already-made responses saying "Yes", "No", "HaHa" and "LOL".
There are some glitches to the update, but if you do own the LG G Watch or the Samsung Gear Live, you might want to give it a shot.
source: WhatsApp via KickedFace, AndroidAuthority