Xbox series X delivery

Microsoft introduces "Smart Delivery" with the Xbox Series X, which means, that if you own an existing game (like Minecraft in your example, or Gears 5) or a new game comes out for Xbox One and Xbox Series X with improved graphics on Series X, you won't
have to buy the game twice.

With Smart Delivery you will play the "enhanced" version on Series X, and the "normal" version on Xbox One.

For more info about Smart Delivery and other terms used with the Series X check this page: https://news.xbox.com/en-us/2020/03/16/xbox-series-x-glossary/

Yes AC Valhalla will be on Series X too and will use Smart Delivery (Buy it on Xbox 1 and you will get the Series X version Free )

They are enhanced for the Xbox One X but Smart Delivery will deliver the best version of the game for your Series X console.

Depends on which console you have

Xbox one x or series x yes

Not recommended for series s

That's based on smart delivery based on your console

Yes. Xbox One games will be backwards compatible with the Series S/X. There are also games like Valhalla and Cold War that support Smart Delivery. With Smart Delivery, you can buy the games now on the One and you'll be able to download the Series S/X version
for free.