What PRO Audio Interfaces and/ or DACs currently work on the Xbox Series X?

Thank you for posting this, I am currently in this same position.

Buying my Sundaras, which need an amp/dac combo or individually, But I dont want to buy another dac/amp when the series X releases.

I will keep an eye out on this thread.

I got my 2 channel DAC connection to xbox one x via optical out. It only works when audio setting is set to stereo uncompressed. The sampling rate shows 48k.

Compared to the current Xbox One interface, what improvements to the UI would you like to see on the Xbox Series X?

i just want to be fast, the actual one is great for me

For most dac/amp combos for chat on xbox, I believe you'll need a Y splitter cable, put that in your controller and connect the Y splitter to your separate microphone (antlion, vmoda what have you) and your hdphns
into the dac/amp combo and your good to go with party chat and audio ( I believe!)

This is correct. Plug the Y into the controller and your mic into the mic half of the Y. Run the other half of the Y into an amp using either a 3.5mm to 3.5mm stereo ("line in") cable, or a 3.5mm to dual RCA adapter cable, depending on what kind of inputs
your amp has. In this case you won't need / can't use a DAC because the controller already does the conversion to analog for you.

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With the current Xbox One, it is possible to use an optical (TOSLINK) cable of virtually any length to a DAC/Amp for game audio, then simply plug a mic into the controller for chat. I briefly looked into lavalier microphones (i.e., lapel mics) as a convenient
alternative to boom mics like the VModa / Modmic, but I haven't tried any.

With the upcoming XBox Series X, there's no clear path to getting game audio into a headphone except to pull it off of HDMI using a receiver, an HDMI switch/splitter with audio out, or possibly a TV with an optical out.

If the XSX will support general purpose audio out and USB microphones, that sort of opens up a lot more possibilities--although the console looks to be short on USB ports when you might need as many as 3 of them for a controller, a DAC and a microphone.

Bluetooth support would be a nice half-measure since there are some DACs that support Bluetooth as well as BT receivers like the Fiio BTR5 or Qudelix 5K that could allow you to beam game audio to the headphones or IEMs of your choice.

The silence on this thread is only reinforcing my suspicion that audio is simply not a priority for XSX. It never really has been, and that has created a circular tragedy where better audio support is not implemented because it's not seen as a priority,
and demand for better audio quality is stifled by a lack of support for it. LAME.

I have connected the optical cable from my xbox to an dac. and analog audio from the dac to my amplifyer