The HDMI Forum's Technical Working Group has released the specs for HDMI 2.1, as well as a new Ultra High Speed HDMI cable. Some of the 2.1 spec's features will be backward compatible with your existing HDMI 2.0 cable, others will require you to upgrade.
Ultra High Speed HDMI 2.1 Enabled Cables and Products Reach the Market
What is HDMI 2.1? An Overview
The PS5 Definitely Comes With A HDMI 2.1 Cable
8K Ultra High Speed HDMI Cable in Black
HDMI 2.0 vs 2.1: Which Cable Should You Buy? - The Plug - HelloTech
What is HDMI 2.1 - Are All HDMI Cables the Same? - The A/V Club
HDMI 2.1 - Introducing HDMI Ultra High Speed Cables & HDMI 2.1
What HDMI cable does PlayStation and Xbox need? HDMI Cables for Connecting PS4, PS4 Pro, and PS5 to Gaming Projectors in 2023
Ultra high speed HDMI 2.1 spec released, with a new cable to boot
HDMI 2.1: what the new cable standard means for your TV
Wireworld Announces Starlight 48 Optical HDMI 2.1 Cables
Slaying the Cable Monster: What You Need to Know About HDMI Cables
AV Access 8K HDMI Fiber Optic Cable, 15m/50ft HDMI 2.1 ARC Cable
HDMI 2.1 Compliance Certification Explained
