Thanks to Fai on Discord and StadiaSource who found this information on Reddit. According to Reddit user giammy977 who spoke to Stadia Support in Italy, all Cyberpunk 2077 Pre Orders will receive a free Stadia Premiere Edition. Giammy977 was checking out the reasons why Cyberpunk Preorder had disappeared off Stadia and this was the response.
Update – This has now been confirmed by The Verge.
Here is an image the Reddit user posted
Cyberpunk 2077 Releases December 10th On Google Stadia. While Cyberpunk is not available to pre-order we expect it will be available later today when the deal goes live.