I first thought. Why is everything so small? Barely taking up the left 50% of the screen and the icons for the channels I subscribe to are almost too small to make out anything. Not even 1/4" on a side.

But turns out it scales up well. And it seems to remember your scaling settings between sessions.

Their blog post: http://youtube-global.blogspot.de/

Also: new video page http://i.imgur.com/y4b4x.png

It's so bright it almost hurts