The Game Pass Version Of Starfield Can Be Upgraded For Early Access
Which is not something I'm going to do personally, but the information may benefit someone. I'm still torn between getting it on Steam or just Game Pass.
I can't seem to find whether it will be Play Anywhere.
I’m getting it on Steam just for the modding capabilities! I like that Bethesda has been good about getting mods onto the Game Pass version of F4 and Skyrim, but those aren’t as extensive as the Steam versions.