YouTube makes sure you know 4K videos are out there
 

Even though most of us are only just now starting to look at 4K / Ultra HD, YouTube has had support for the high-res video since 2010 (just two years after it started streaming in HD!). With more than four years of experience under its belt the video...

http://www.engadget.com/2015/02/25/y...=rss_truncated