It is already out, has been for a while. You need a gamepass unlimited subscription to access it and the appropriate app on your console, PC, or mobile device.
It's definitely Series X running the cloud version. Firstly, all 9th gen layers are present, and you get 100-car trains on Sherman Hill. Secondly, MS put out a press release a couple months ago announcing that all xCloud server blades had been updated to Series X. Make sure you're using the 5G band on your router- it greatly improved performance for me.
I can switch from 4K to HD in the settings. I mean that only works in the One X version. And also the performance does not speak for XSX. I also already had the Out of Video Memory Error.
You should see additional services though if you own those add-ons on xCloud? Southeastern services shows up in London-Brighton, which means it cannot be Xbox One hardware. I can change to HD on both platforms.
Hmm. I can’t access any of my add ons when using xcloud gaming…. Only the base game… how do i do that?
