Will it be possible to transfer your Xbox one games to the XsX or XsS, or will you have to buy them again?
Since it should be backwards compatible, you can continue to use the games.
I don't know whether this also applies to the discs. But when it comes to digital purchases, I'm sure.
Very good. I only have digital purchases
You can play retail and disc games on the XsX, as well as 360 and classic games. Of course, this also applies to digital games, but I don't know exactly what happens with the disc games on the XsS because it has no drive.
Exactly the same for discs, I just think there's no way to transfer disc games to the Series S.
If you use the same account, you can take all games with you.
Since the XsS has no drive, of course only the digital games would go there
All discs are compatible with Xbox Series X 😄
Thanks to the backward compatibility, you can play all games on the new console. (Both digital and disc)
It is up to the developers themselves whether there will be free updates to the correct versions for the new consoles. Up until now these have remained free, with a few exceptions.
