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"For video there is support for higher resolutions and frame rates—including 8K60 and 4K120—that provide a greater level of immersive viewing and smooth fast-action images. The spec also supports 10K resolution,..."

"We also are introducing a new 48G cable to enable bandwidths up to 48 Gbps and support for the full suite of 2.1 features. HDMI 2.1 uses existing connectors and is backwards compatible with all existing HDMI devices."

"HDMI 2.1 is the latest version and therefore will supersede and eventually replace 2.0b. The 2.1 specification builds upon the foundation of the 1.4b specification and continues to make reference to it to ensure backwards compatibility with the billions of existing HDMI devices."