The Droid Turbo (2014) has just received the newest security update. The software of course also brings some performance improvements.
Unfortunately, the Android version remains at Lollipop, which means still no Marshmallow nor the info if the device will get the newest Android at all. Anyway, the notification for the security update should pop up automatically on your phone. If it doesn't or you are feeling impatient, you cand check for it manually in your hadsets Settings menu.