Google have updated the Android YouTube app with a few new features. The updated app has improved video quality for devices running Android 4.2 and above as well as automatic playlists for music videos, delete and reply to comments and share playlists.
You can find the app in the Google Play Store.
* YouTube Mix automatic playlists for music videos
* Reply to comments
* Improved video quality for Android 4.2 and above
* Delete your own comment
* See if a comment was shared privately or publicly
* Share and like playlists
* Your liked and personal playlists appear in the left-hand guide drawer