Apple could indeed surprise us, but given that Touch ID came first through the MacBook Pro, I think we are more likely to see Face ID start on the high end of the lineup.
Unfortunately, white paper or no white paper, in order for any future Macs to have FaceID, the following three items will be needed -
- A T-series ARM co-processor that includes the neural engine and the Secure Enclave from the A11 Bionic. Let's call it the T3 Bionic for $#!t$ and grins.
- A True Depth Camera system fitted inside the top of the screen of an iMac, iMac Pro or MacBook Pro.
Neither of these is going to be cheap to implement. I am sure Apple will do it at some point, just not this model right now. I have no skin in the game either way, but I am looking forward to seeing a new MacBook that takes the best of the 12", fixes it's most egregious sins, gives us a more powerful computer at a better price and evokes some of the same emotions people seem to have for the MacBook Air.
Looking forward to tomorrow, hopefully, Apple will show a bit of whimsy.