Currently, broadcast TV, such as CBS, NBC, etc., and cable providers have no short term plan or intention to even consider 4K. They are too busy scrambling to squeeze every penny out of current outdated low resolution shows. They have been given the gift of 4K upscaling built into new TVs to make pictures look better.
The logo can be used starting in January 2020.
To use that logo, a TV must have resolution of "at least 33 million active pixels, with at least 7680 horizontally and 4320 vertically within a 16:9 viewable window." One or more of the HDMI inputs must support "7680x4320 pixels; bit depth of 10-bits; frame rates of 24, 30 and 60 frames per second; HDR transfer functions and colorimetry as specified by ITU-R BT.2100; and HDCP v2.2 or equivalent content protection." It must also be able to upconvert SD, HD and 4K video for display at 8K resolution and be able to receive and render 10-bit 8K images.
Bottom line, if you need or want a new TV, save your money and get a 4K TV. Experts recommend a 65 inch as the smallest 4K TV to buy so you can enjoy the wonderful resolution.