YouTube has recently had a UI update, with changes including threads on the comments section and making interactive elements transparent so that it doesn't cover up content. Its classic YouTube logo will be staying the same.
Probably the most fun element of the new look are new animations that occur when you click the 'Like' button. Which animation you get depends on the type of content that you are appreciating. So if you 'Like' a travel video you get a little aeroplane, for example, and if you 'Like' a cooking show you get a knife and fork.
