Xbox series x backwards compatibility question.

It will probably become backward compatible with series x. In this moment the backward compatibility project for xbox one has been stopped, waiting for series x

And, if it were not backwards compatible, you might have to wait until the release of Xbox Series X, as they have said they have stopped working on bringing Backwards Compatible titles to Xbox One until the Series X launch to get Backwards Compatibility
up and running on the Series X. Form there, I imagine they will move back to bringing titles to both Series X and Xbox One for a few more years.

Yeah, like others mentioned, Microsoft hasn't announced anything official about the Kinect yet.

If a Kinect is compatible with the Series X, then I would imagine it would be the Xbox One Kinect with the USB adapter.

Also, when it comes to the Series X, Microsoft have already said it will be backwards compatible with everything that already works on the Xbox One family of devices.

https://www.cnet.com/news/xbox-series-xs-backward-compatibility-we-have-so-many-questions/

Just to point out, I see some people making the mistake of referring to the new Xbox Series X. This question is specifically for the Xbox One X, not the new console. I have no intention of buying the new Xbox Series X.

The same thing applies to the one x. There are even some developers that have came out and down right said they would never allow their games to be backwards compatible. So no not everything will be. They have also stopped working on backwards compatibility
for the xbox one as that team is working on the series x right now.

No further backward-compatible releases are planned as the team prepares for the launch of Xbox Series X. Reportedly, the Series X will be fully backward compatible with any release on the previous consoles, so there is a chance that it may well be playable.