To summarize, all newly created YouTube accounts will now have the new channel design. On July 15th, all existing and new accounts will receive the new channel layout.
To learn more about the new channel design, and how to use / customize the new channel layout, take a look at this FAQ in the Help Center:
Just wanted to keep you all in the loop!
Hope this info's useful,
p.s. you can leave your feedback on the new channel layout:
-- By posting on the new channel blog:
-- By commenting below the official YouTube blog:
-- By posting your thoughts in the "Feedback & Suggestions" section of our Help Forum: