Just happen to randomly check and found it on my phone and then found an article about it.
http://www.droid-life.com/2014/10/30/droid-turbo-receiving-day-1-update-to-build-21-21-15/
http://www.droid-life.com/2014/10/30/droid-turbo-receiving-day-1-update-to-build-21-21-15/