Okay, my explanation of the technology is a lot longer, but I will offer the short version -
People think Ultra HD is all about the 4K resolution. It's not. Well not entirely. UHD is a technology, one that's never been used before. Never been possible before. We will see an image quality that will blow our minds and that has more to do with the technology than the resolution.
Current TV's are based on the old CRT technology. The colour gamut is merely a tiny percentage of what our eyes can perceive. True Ultra HD TV's offer a Wide Colour Gamut and HDR technology. Those two are game changers and will forever alter the way we perceive images.
Black levels will be as accurate as real darkness. White level will be as bright as the midday sun. Colour saturation will be more than our eyes can perceive. Offering life-like images, never before seen. It will be like looking out of a window.
True Ultra HD offers striking visuals that simply aren't possible at the moment. Most 4K TV's on the market don't offer this technology, well, not on a consumer level, at least. It will take some time before we get there. So, by the end of this year and next year, we shall see what Ultra HD is really about.
That is why I think it's a marketing gimmick. Retailers are using the hype of "4K" resolution to drum up sales, and the average Joe will not question it. He will simply see a board saying "3840x2160 Resolution" and he will say "Wow! That's double the resolution of Full HD (1920x1080)". Not realising that their new shiny, expensive 4K TV will be obsolete in a year.
And even if he did question it, the shopkeeper wouldn't have a clue about Rec. 2020, 10-bit panels, HDR and WCG technology.
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Here, watch these videos. It will allow you to have a much better grasp on the technology of UHD (4K) -
Understanding HDR: An Interview with Joel Barsotti and Stacey Spears - YouTube
Panasonic 4K Picture Quality Meets Hollywood Standards - YouTube
Start the second video at the 3:47 mark.
Cheers.