Here are some of the new features found on WatchOS 2 Beta 519
When playing music, you can shuffle tunes by clicking on the new Quick Play button. For those Apple Watch users who need more than 15 seconds to view the screen after waking up the timepiece, you can now arrange to have the display stay on for 70 seconds. Another change now puts an icon on the screen when the data from a workout is being captured by the timepiece.
WatchOS 2 beta 5 can be installed on the Apple Watches belonging to members of the Apple Developer Program from the Developer Program website. Keep in mind that some of the new features available on this, or any other beta version of the OS, might not be 100% perfected yet.