Google continues to change the design of its products and it looks like the YouTube update is getting where it belongs. If you do not want to wait to see the new design when it is released, follow these steps in Google Chrome.
Before you can see the new design, you should use Chrome and visit the American version of the site instead of the local version.
So open the address
Using the three buttons ctrl + shift + i open the developer tools
Go to the Resources tab and delete the VISITOR_INFO1_LIVE cookie that exists under your YouTube domain.
From the Chrome console, empty any other previous command and run it below to specify the cookie VISITOR_INFO1_LIVE:
document.cookie = "VISITOR_INFO1_LIVE = Qa1hUZu3gtk; path = /; domain = .youtube.com";
The new plan will appear, but you do not need to be logged in to see it. If you are and follow the instructions above, to see the new design, log out.