Possible alarm clock integration coming to Google Play Music in future update
A recent app teardown by Android Police revealed that Google may be slating Play Music for some sort of alarm clock integration in the near future. Evidence from the teardown suggests that the option to access Google's Clock app may be added to Play Music in an upcoming update. This means that you will likely be able to chose one of your favorite songs to wake you up every morning (until you can't stand it anymore), or opt to be woken up by a random track, radio-alarm-clock-style.
If previous such teardowns are anything to go by, the feature will likely be implemented in an upcoming update for Play Music.