As it turns out, that speculation was correct, and the upgrades are now available as free downloads for all current owners of the original games, as well as being purchasable from the Xbox Store. You'll find new ray tracing support, improvements, faster load times, higher frame rates, 3D audio, and more.
what are you writing here?! the upgrades arent available as free downloads neither are they purchasable. they just added the stuff into the game files.
that means, the games you already own are upgraded and the store just contains the XBO/XS version. Smart Delivery... you know. frim.now, you buy the upgraded version from the store and thats it. like they did with AC Origins