Wait for the Game awards in December, we will most likely get a gameplay revel there.
"It's official! Stadia launches November 19, and we can't wait to play. Learn more about Baldur's Gate 3, Stadia, and everything else, soon!" this was a tweet from Larian Studios in response to a tweet about Stadia, so it's likely sooner then November 9th. I think Larian has been holding their powder on BG 3 news because they are waiting to a particular feature or features in reguards to Stadia to be announced first or at the same time, something about BG3 that ties into it.