We just launched a new voice chat app that works with Samsung Gear and Android Wear. You can send voice messages to anyone (iPhone, Android, Windows Phone and BlackBerry) directly from your Android Wear or Samsung Gear smart watch! If you and your friend both have smart watches you can send from watch to watch. Unfortunately current Android Wear watches do not have a speaker so in that case message will play on phone.
I think it's a really cool and useful app for smart watch enthusiasts.
Please try it out Download VOZ
Feel free to post any questions you have here and I will try to answer.