In January it was revealed that Microsoft was working on a Windows 10 authenticator app for mobile devices that would allow users to just tap on their PC to open it, via a Bluetooth connection. Now, that app has a listing in the Windows Store, but it's not available to download yet for the general public.
"The first step towards a world without passwords! After a quick Bluetooth sync, use this app to unlock your Windows 10 computer at work. Just open the app and tap on a nearby computer. Note: This app is still in beta. Future versions will include support for Microsoft account, a sign-in solution for browsers and VPN, one-time passcode generation, and MFA approval through notifications."
Again, the app is not available to download yet for the general public, but the fact that it is in the Windows Store means that the app might be getting close to a launch.