New Apple nfc door opener as seen on iPhone 12 keynote video? Anyone has info about this technology? Looks like we can scan nfc or emulate keys on the embarked nfc chip? or is it only for apple internal use?
NFC detection is available to app developers on iPhone for some years since iOS 11.

https://developer.apple.com/documentation/corenfc

I use it for hardware authorization with yubikeys and 1Password app.

https://apps.apple.com/us/app/1password-password-manager/id568903335
https://www.yubico.com/us/store

Apple hardware can scan for NFC and then take whatever action the developers code up for the apps.