Google is again working on a brand new YouTube layout which is still to be rolled out to everyone officially. The new layout tries to arrange and manage the information much better compared to existing one. The left hand side column lists your channels along with the subscribed ones. It also lists Popular and trending tabs which pulls the popular and trending videos from YouTube. It also lists some recommended YouTube channels for you based on your interests.
Apart from the left column, the other two columns shows your subscription videos and recommended ones. The layout looks clean and it seems that it is based on the concept of integrating Google+ with YouTube which is almost a trend now with all Google Products.
Enable YouTube Brand new Layout
1. Open YouTube by typing http://www.youtube.com in your browser address bar.
2. Press Ctrl + Shift and J in Chrome to open the Developer Tools or Press Ctrl+Shift+K in Firefox.
3. Click on the “Console” Tab in chrome and enter the following.(For Firefox, there is no console tab available though. Just enter it)
4. Reload the website and enjoy the new layout.
Via: Moritz Tolxdorff+