In terms of display tech, I am much more excited about OLED, which makes a significant difference in image quality compared to what you get with the 4K LCD TVs that are available now. Not to mention that there is very little 4K content as of yet, though this will change soon enough.

Even when you have a TV that supports 4K (i.e. sufficient number of pixels + HEVC decoder chip in order to use services like this), a very large screen is needed for viewers to appreciate the higher resolution at a sane viewing distance:

http://www.rtings.com/images/optimal-viewing-distance-televi...

The article mentions an average bitrate of ~16 Mbit/s for the streamed content. Even with the awesome compression efficiency of HEVC, I would expect noticeable compression artifacts with such a low bitrate. Consider that Blu-rays (usually encoded with AVC) often have a video bitrate much higher than that. Is this going to look any better than Blu-ray? I doubt it. Better than Netflix's 1080p streams, though.

In any case, this is good news. The relentless march of technology continues! Let's hope for consumer OLED 4K TVs in the near future.