HDMI 2.2 is coming

[desray]

Yes, it is backward compatible but no, you need new hardware and cables to support all the goodies that HDMI 2.2 brings to the table.

Source: HDMI 2.2 cranks the bandwidth to 96Gbps and aims to eliminate audio sync issues forever - The Verge

Wow…4K at 480Hz and 8K up to 240hz!

Source: HDMI in the News - Press Releases