Google just announced Android Wear 2.0 and the LG Watch Sport and the LG Watch Style are two new watches that are being released with the upgraded operating system. The Watch Sport includes a built-in cellular radio (LTE) so that you can use the watch without your phone. However, it's a much larger watch.
The LG Watch Sport includes a built-in GPS and optical heart rate monitor. So, it could be a really nice running watch for people who want to leave their phone behind and still stay connected to the rest of the world. The real usability test will depend on battery life: can you go on an extended run while using the GPS, LTE, and heart rate monitor?