Pre Orders commence shipping from 19th November 2019.
Play Stadia with Premiere Edition. Get access to Stadia and three months of Stadia Pro included. Combine Chromecast Ultra3 with a Stadia Controller to play in up to 4K on your TV, and also play games on Stadia across all supported devices in early access.
Get three months of Stadia Pro subscription included with Stadia Premiere Edition, unlocking access to an ever-expanding library of free games starting with Destiny 2: The Collection (including the Shadowkeep and Forsaken expansions with Annual Passes, Curse of Osiris and Warmind).@BuzzDuraband
has put together a decent introductory guide here:hotukdeals.com/discussions/everything-you-need-to-know-about-google-stadia-3324879