I'm curious to see how games are bundled at the backend. I assume Microsoft are adopting an Apple iOS-type module bundling system where the game downloads code and graphics dependant on the remote platform. That said, maybe there isn't a lot of space saved reducing graphical assets for 1440p output vs 4K. So many questions! Well, ok, one question. But I'm still curious!
I guess we'll have to wait for some back-side box art showing install sizes of games.
I assume they're still using the packaging structure they switched over to a few years ago -- https://forum.beyond3d.com/threads/xbox-faststart-and-microsoft-intelligent-delivery.60370/.
It still relies on developer tagging and separating out the content appropriately. I guess maybe two different options for game assets, one for base and other for "hi-res" for Series X.