Other new/different items - HD and CC buttons are in the 3 stack menu button on the top right hand corner of the video, the auto-rotate settings work better (mainly for phones) and you can also search for playlists now instead of just videos or users.
Two other items to mention - the TV Queue UI has been updated
And finally this update give you a new icon seen here:
This update is being rolled out in phases. If you don't want to wait your turn, hit up the source link to get your very own copy to install yourself. Be sure to tick the UNKNOWN SOURCES in your settings before installing.