What is 4K Blu-ray?

The industry has learned from its past mistakes, at least a little. 4K players will all play standard Blu-ray discs and DVDs as well, for example. There’s also only one format! No UHDDVD or other such nonsense. All the manufacturers are on board for a single unified format, so the great Blu-ray vs. HD-DVD format war is ancient history. – Geoffrey Morrison, CNET http://cnet.co/2oEEoNG