Today, YouTube have finally allowed everyone to be able to upgrade their channels to the new design. YouTube calls this design ‘One Channel’ and it’s main focus is to make a user’s channel look great across all devices. It will also help you to convert more visitors to subscribers with a channel trailer, and you can customise and organise the way your videos and playlists display on your channel.
If you visit youtube.com/onechannel, you can migrate your channel over to the new design and YouTube will give you a tutorial on how to set everything up. For a limited time, you will also be able to go back to the old design if you want to.
(Source: YouTube Creators)