Due out by the end of the year. To shut up any infuriating salesperson that goes on about 'mastered in 4K' titles…
http://www.businesswire.com/news/home/20150512005300/en/Blu-…
Los Angeles, May 12, 2015. The Blu-ray Disc Association (BDA) today announced completion of the Ultra HD Blu-ray™ specification and released the new logo that will delineate Ultra HD Blu-ray products. The Ultra HD Blu-ray specification, which represents the work of global leaders from the consumer electronics, IT and content creation industries, will enable delivery of Ultra HD content via Ultra HD Blu-ray Disc to the rapidly growing number of UHD TV households.
Good stuff, I look forward to actually viewing 4K video on my 4K display. Although I'm still pretty content with 1080p