I think the Casino expansion will arrive in 2024-2025 with performances enhancements from CD Projekt and from Google (AV1 codec ? New blades ? We just know some indies announced new tech and services coming soon)
RE8's expansion on Stadia is cool but i understand PS4 owners won't be hyped and blown away by such cross games...
On the other hand, dynamic open worlds Cyberpunk really shine on Stadia: Performances boosts, new tech from google enhancing graphics, no update, no DL, everything is growing in the clouds without need to download, install, uninstall like the pretty cool XBXSS(due to storage limitations... Series S users can play Stadia on their console to save space and time).
In addition, Cyberpunk expansions won't be available on PS4 anymore.