Windows 10 Features roadmap for business confirms what we knew yet in form of the “Phone sign-in Beta” app. Soon you should be able to use your Windows 10 Mobile or even Android smartphone for unlocking your Windows 10 PC. Even Microsoft Band 2 or other devices that integrates with the Windows 10 Companion Device Framework (CFD), as companion device for Microsoft Passport based authentication will be able to unlock your PC in future.
Use your phone to unlock your Windows PC
Use your Windows Phone or Android phone as remote credential store which can be used to unlock any of your Windows 10 PCs and authenticate with apps and services that support Windows Hello and Microsoft Passport based authentication.
Use Companion Devices to unlock your Windows PC
Use your Microsoft Band 2, or other devices that integrates with the Windows 10 Companion Device Framework (CFD), as companion device for Microsoft Passport based authentication. With this a device like the Microsoft Band 2 or other third party devices, they can become an external second factor of authentication which can be used to unlock your Windows 10 PCs.