Modern layout for 1080p res, lets you watch videos while being able to scroll and read the entire comments section, by pinning the YouTube video to the left-side page. Plus, a sleek 'More Videos by same user' playlist feed is auto-generated for the current channel and 2 very useful quicklinks are added: 'Most Popular' and 'Newest' sorted user videos. See screenshot for preview.
This would be far more useful if it worked in theater mode, this way the comments and video remain visible at a comfortable size. As is, only parts of the video or the comments are visible at the same time unless you scale it making the video&comments too small to see/read.
When switching to theaters mode the comments revert back to there original place under the description.
Oh, and did I mention...Please update.