I think vzaliva didn't quote the right part, and was referring to how the Yubikey is going to depend on Windows to enroll your fingerprint with it.

Only the static password and one time password modes though. In those modes, the YubiKey acts like a keyboard and literally types out the password when the user presses the button.

The flagship YubiKeys can also act like a smart card. They are PIV compatible and support X.509 certificates. They can also store encryption, authentication and signing OpenPGP keys. GNU Privacy Guard opens the YubiKey as if it was a smart card.