Above is the new Youtube look!! Not sure whether this is just experimental or something which is a possible new iteration of the video giant. In any case , if you want it just follow the steps below:

Step 1

Open http://www.youtube.com in Google Chrome

Step 2

When the page has loaded completely, hit Ctrl+Shift+J (Windows) Alt+Command+J (Mac OSX) . This opens a panel below. Select the Console tab.

Step 3

Enter the following commands as shown below:

document.cookie=”VISITOR_INFO1_LIVE=jZNC3DCddAk; path=/; domain=.youtube.com”;window.location.reload();

Step 4

Hit Enter.Refresh the page.

VOILA! Welcome to the new design! 😀

Source: http://www.omgchrome.com/how-to-new-youtube/