Android 6.0 Marshmallow adds a slew of useful features including Google Now on Tap, Doze power management and App Permissions. The remainder of the features, for those interested, are rounded up in our Android 6.0 Marshmallow review.
Though it does appear that the recent hiccup has been resolved and that Marshmallow-less DROID Turbo 2 owners should see the update shortly, it may not hit your handset immediately. These updates, after all, tend to be phased. If you'd like to try and speed things along, you can do so by firing up the Settings app, hitting About Device, and checking for the tasty care package that way.
If you've already caught the update for the DROID Turbo 2, let us know how it's going via the comments.