This isn’t really a surprise and it’s something of old news. Juli Clover on Apple’s upcoming method to unlock your Mac with iPhone’s Touch ID and Apple Watch:
Apple engineers are designing an auto unlock function that would allow an iPhone to unlock a Mac when in close proximity, alleviating the need to enter a password on a password-protected Mac.
The feature, which uses Bluetooth LE frameworks, will presumably work similarly to the automatic unlocking function on the Apple Watch, which allows an unlocked iPhone to bypass the passcode restriction on a connected Apple Watch. In this scenario, an iPhone’s Touch ID button would likely be used as a verification method for simpler logins.