I read that the Vivoactive has an app/widget that allows you to operate basic playlist controls (forward/backward/pause/etc.) on your phone from the watch face. As a runner who routinely has his phone strapped to his arm for music (and safety/emergency) reasons, I can see this being a handy function for those who want to skip around in their playlist while running.
I know that my iPhone headphones allow me limited back/fwd functionality with a "click", but it would be really nice to see a truncated version of your music playlist on your watch while running and be able to select songs for play, skip songs, etc. (understandably, you'd be switching back/forth between your "run" data screens and the screen for the app/widget)
I haven't seen the app on the Vivoactive, but as a new owner of the Fenix 3 (and loving it so far) I could see this as a potentially popular app/widget for those long runs.
