From The Verge: “When Google announced that its Stadia cloud gaming service would launch November 19th, we thought that meant those who shelled out $130 for a Founders Edition would get to play right away and when the company announced it was replacing the sold-out Founders Edition with a new Premiere Edition earlier today, the question was: would Premiere Edition buyers get to play on November 19th too?”
Source: N4G PC Google says you might have to wait to play Stadia, even if you preorder