With leaked details of octal-core processor banks paired with 8GB of RAM, the PlayStation 4 "Orbis" is sounding powerful (just for comparison of RAM alone, the 8GB of system memory is roughly 32 times more than the current model). But to see where 4K comes in it's worth taking a trip back seven years.
In 2005, very few people had an HDTV. According to one study, there were "as many" as ten million homes with high-definition screens -- globally. The problem, according to many commentators, was the lack of HD content: nobody wanted to buy an HDTV because there was little HD content; very little HD content was made because there were very few people to sell it to. Classic catch-22.