In a nutshell, HDMI 2.0, will introduce higher frame rates. Current HDMI 1.4 technology sends video signals to your TV at approximately 10 gigabits per second, 4k video with up to 30 frames per second. HDMI 2.0 doubles that, to 20 gigabits per second. This makes it possible to show true 2160p 4k video at up to 60 frames per second.
There will also be improvements in audio, HDMI 2.0-compliant devices will transmit up to 32 audio channels, far superior to 7.1 surround sound. HDMI 2.0 also supports up to 1536kHz audio sample frequency, which allows it to more easily sync the audio with what is happening on the screen, such as lip movements.
According to the HDMI 2.0 Website:
HDMI 2.0, which is backwards compatible with earlier versions of the HDMI specifications, significantly increases bandwidth up to 18Gbps and adds key enhancements to support continuing market requirements for enhancing the consumer video and audio experience. New functionality includes:
- 4K@50/60, (2160p), which is 4 times the clarity of 1080p/60 video resolution
- Up to 32 audio channels for a multi-dimensional immersive audio experience
- Up to 1536kHz audio sample frequency for the highest audio fidelity
- Simultaneous delivery of dual video streams to multiple users on the same screen
- Simultaneous delivery of multi-stream audio to multiple users (up to 4)
- Support for the wide angle theatrical 21:9 video aspect ratio
- Dynamic synchronization of video and audio streams
- CEC extensions provides expanded command and control of consumer electronics devices through a single control point.
HDMI 2.0 does not define new cables or new connectors. Current High Speed cables (Category 2 cables) are capable of carrying the increased bandwidth.