The update adds a new Air Command menu, and a note-taking feature that uses the S Pen to scribble notes in white on a black background. These notes can be saved for quick recall when needed. The Android 6.0 update has already been available for multiple devices in some European countries like Hungary, where the LG G4 is already sporting it.
The latest distribution data released by Google shows that only .3% of active Android handsets are powered by Android 6.0. It is hard to believe, but this is only .1 percentage point more than the .2% share of Android phones running Android 2.2 Froyo. Once U.S. carrier testing of Android 6.0 is completed, we should see Marshmallow's share rise considerably.
As usual, unlocked Android handsets deployed overseas are getting the opportunity to run Android 6.0 after stock Android Nexus and Google Play edition phones were taken care of first.
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source: NapiDroid (translated)