When HDMI 2.1 sources and sinks come out, simple: buy an HDMI 2.1 -> HDMI 2.1 + HDMI 2.0a splitter and use your current HDMI 2.0a receiver for audio only. The audio component doesn't need HDMI 2.1 and never will.
Do not agree
AMD put Warnings HDMI 2.0 cable up to 1 1/2 meters in length
the next version of the HDMI standard version 2.1 an improvement for sound
Adaptive frame rate & better audio support
a new “eARC” features is highlighted. This is an extension of ARC – audio return channel – to enable support for object-based audio formats such as Dolby Atmos and DTS-X.
from Screen/tv via HDMI 2.1 to receiver
End to SPDIF
eARC in HDMI 2.1 supports the most advanced audio formats such as object-based audio, and enables advanced audio signal control capabilities including device auto-detect.
HDMI 2.1 highlights: immersive viewing and smooth fast-action detail
to really 12BIT + HDR 4000NITS ( hdmi 2.0 built by theories without testing )
hdmi 2.0 1000NITS 4:2:0 leads to incorrect results with 10bit ( It's not just this cable also chip in the tv)
HDMI 2.1 Specification supports the latest color spaces including BT.2020 with 10, 12, and 16 bits per color
Manufacturers do not tell Why we not have REC 2020 ( not hurt sales )
HDMI 2.0 crappy ( for two years no problem reaching 90% in REC 2020 color on led )
so why we have only P3 and no rec 2020 ?
1. Sell More screens ( and not give all in the same year 80%/90%100% OF p3 )
2. HDMI 2.0 crappy Standard ( Do not forget HDMI 2.0 Cable Built FOR HDMI 1.4 the same cable only with 600 hz that Failed )
with HDR 10/ Dolby Vision/dynamic metadata 12BIT in hdmi 2.1 ensures every moment of a video is displayed at its ideal values for depth, detail, brightness, contrast, and wider color gamuts—on a scene-by-scene or even a frame-by-frame basis.
( today with content know HDR 4000nits +10/12BIT+p3/2020 ONLY in HDMI 2.1
HDMI 2.0 Built in 2013 So there was no material to test the HDR or P3 or 2020
The trouble began with graphics cards and found that you can barely get 10.2 GHz bandwidth in 4 K
With HDMI 2.0 ( So they invented HDMI 2.0A AND B / Big bull**** )