Google announced their latest data center-based platform, Stadia, today, and they also announced that the platform will have its own controller that will be sold separately.
Stadia Controller connects via Wi-Fi to the game running in the Google Data Center, and identifies your game session for seamless transfers.
Apart from standard features on a controller, the new Capture button saves and shares the player’s game experience, while the Google Assistant button allows you to ask for help via a built-in microphone.
Oh, and it seems to have the Konami code etched in at the back.
That said, Google stated that it welcomed players to use their own controllers, such as USB controllers for your devices.
Edit: Here’s a clearer look at the controller from Google’s press release: