Unfortunately there is nothing new mentioned via hardware or software that apple would be supporting additional audio or video formats besides hdr10+
Have Apple stopped selling the AppleTV HD and AppleTV 4k (2021)?
Yes they have
New Apple TV has 4GB of RAM up from 3GB.
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Here is a summary of changes
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Hi,
In the audio specs found in te Apple Website, hereās what they list :
HE-AAC (V1), AAC (up to 320 Kbps), protected AAC (from iTunes Store), MP3 (up to 320 Kbps), MP3 VBR, Apple Lossless, FLAC, AIFF, and WAV; AC-3 (Dolby Digital 5.1), E-AC-3 (Dolby Digital Plus 7.1 surround sound), and Dolby Atmos.
Does it mean that weāll be finally able to play Dolby True HD in 7.1 and other 7.1 audio files or am i missing something ?
Infuse can already play 7.1 HD audio files. You just cannot bitstream them to get Atmos.
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The Dolby atmos reference is in regards to Dolby atmos on top of e-ac-3 so lossy and not TrueHD.
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New details emerging and good news:
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How many TVs work with QMS VRR, you ask? Well, zero at the moment.
Okay then 
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But isnāt QMS an Subset from VRR?
Maybe a TV which support VRR could support QMS, too? 
LG OLED are rumoured to support it but since thereās no players on the market that support QMS thereās no way to confirm. QMS is a separate feature that uses VRR to initiate the change. Itās usually up to the manufacturer on which specs they want to implement with HDMI 2.1. That being said if a tv doesnāt support QMS but does support VRR the manufacturer might be able to add support via a firmware update.
I am interested to see from a teardown what has actually changed with the hardware. specifically the DP/HDMI converter. The 1st and 2nd gen used the same chip (ifixit), which per the mfg. specs (Kinetic) listed pretty limited audio handling (LPCM). New hardware in the 3rd gen may provide some hope for improvements on the audio, if in fact a more capable chip and Apple exposes it to developers. It would be nice to finally get the long requested DolbyTrueHD/Atmos. Here is hoping.
The chip does not affect the sound playback in Dolby TrueHD Atmos. This requires bitstream support. Until bitstream support is returned to tvOS, there will be no Dolby TrueHD Atmos sound in the player, no matter which chip is installed in the player. There is only hope that using Spatial Audio in firecore they will be able to implement Atmos in infuse. Discussed here - Enhanced spatial audio support (Atmos) - #38 by HotSauce
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Thanks. I donāt agree the chip doesnāt matter. For example, bitstreaming TrueHD or Master Audio wasnāt supported over HDMi until v 1.3. Regardless, I am merely saying is if the 3rd gen has been updated to something more recent that makes me hopeful for some progress on this front, but I have no idea what that might be, or when, if ever. Time will tell.
But it seems there comes an Update for QMS_VRR later this year for the 2022 Model only. Does this maybe mean itās a new Chip on the 2022 model?
I canāt believe that the very old chip, which has been used in the older AppleTV Models many years ago, support this new Featureā¦?
Hopefully there is a new Chip which could render finally also the UI in 4k120hz, which Iām awaiting for a long time
All generations of Apple TV 4K have HDMI 2.0-2.1. Only bitstream support is missing.
The situation with 4k120hz is such that there is not a single movie in 4k120hz. Today, this applies only to the gaming industry.
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ProMotion doesnāt need to apply to movies and shows but to the interface, scrolling, etc.
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