The first iteration of the feature is limited to the browser extensions. It uses security keys that are generated on local devices and local authentication options, such as a user's face or fingerprint, or a PIN, for authentication. Passkeys is a new authentication standard that will replace passwords to a large degree in the coming years. Announced in May 2023, the feature is now finally available.
One of the main new features of Bitwarden is the ability to store passkeys in user vaults. Once enabled, Help > Check for updates should also return the latest version in the client.
You may select Help > About Bitwarden to display the installed version. Users may download it from the official website to upgrade to the new version. The new version is not available via the application's built-in updating system.