ATSC was approved by the FCC on November 16, 2017. As Jeffhs said, ATSC 1.0 will be required to be broadcast for 5 years then it goes away as things stand now. ATSC 1.0 and 3.0 will broadcast simultaneously during the next 5 years in the individual markets that adopt ATSC 3.0. ATSC 3.0 IS VOULENTARY. Television manufacturers will incorporate dual tuners for 1.0 and 3.0. on new sets. Converter boxes will be available to receive ATSC 3.0 on existing sets just as digital converter boxes allow OTA 1.0 to be seem on analog sets.
Broadcasters now have the ability to send “premium” OTA 4K broadband services along side the free 4K broadcasts. As it stands now Congress mandates every household to be able to receive free OTA television. ATSC 3.0 claims to be more reliable that can be received from longer distances including deep into concrete buildings. It can be received by mobile devises and fast moving cars and commuter trains. It has multi channel sound beyond 5.1 surround. Wide color gamut and high dynamic range is available for those that care.
Premium services OTT will be go beyond what cable and satellite provide with better quality. This is why the cable companies were fighting the adoption of ATSC 3.0
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