I'm not sure how it's all that different from Windows Hello.
> Passkeys are easy to set up and let you securely sign in to your Google Account using your fingerprint, face, screen lock, or hardware security key. You can create a passkey on this device, or use another device.
When I press [Continue], Windows Security appears where I can then scan my fingerprint which I already use to sign on.
A single glide of my finger worked as expected and a 'Passkey created' screen appeared with [Done] being my only option to continue.
Windows Hello can supply single-device passkeys at the platform level. Browsers and native apps will leverage Hello in the background (a la WebAuthn.DLL).
A passkey is a user facing term. Platforms have been working on technology to support that idea for years now.
There may be a difference in terms of how Windows Hello dictates the user experience vs what browsers show on other platforms - I haven't tried it recently.
> Passkeys are easy to set up and let you securely sign in to your Google Account using your fingerprint, face, screen lock, or hardware security key. You can create a passkey on this device, or use another device.
When I press [Continue], Windows Security appears where I can then scan my fingerprint which I already use to sign on.
A single glide of my finger worked as expected and a 'Passkey created' screen appeared with [Done] being my only option to continue.
After a sign out, re-enter of my gmail and these are the next few steps: https://imgur.com/a/heLrUkb
It seems like it just integrates the built-in verification methods depending on what device you are on.