The possibility of an enhanced version of HDTV as an alternative to 4K and even as an alternative to what people are calling real UHD or premium UHD (meaning 4K plus high dynamic range, higher frame rates and wider colour gamut) seems to be gathering support.
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http://www.v-net.tv/serious-interest-in-enhanced-hdtv-with-hdr-as-an-alternative-to-basic-4k