YouTube constantly revamps its app with new features. The latest update is now focussing on the fullscreen video player.
YouTube for Android now sports new media icons at the bottom of the app including the like and dislike button.

Other icons visible below the scrubber include the share button, save to playlist and the comments icon which when tapped opens in the right sidebar.

At the bottom right is the More Videos shortcut that sports a thumbnail preview in a carousel format.
Other changes include a full settings gear and when you tap on the title, you are redirected to the full video description.
