Biometric Scanners on Surface 3?

Unlikely. Requires Infra-red camera or fingerprint reader etc. And the unit has none of those.

Note: It still has a TPM so Passport will likely work, you'll just have to type your password.
 
Does facial recognition require any fancy hardware like that?

Yes. The demoed facial recognition requires stereo infra red cameras that will release with new laptops in the fall with Windows 10. Current web cams will work just as web cams. At least that was what was announced somewhere.
 

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