These guys have been ripping apart the new Xcode and found a lot of good stuff. Seems the new T1 ARM processor handles security for TouchID, Touch Bar and camera. Supposedly it's for the camera also so people can't mess with it for security purposes.
https://twitter.com/stroughtonsmith
https://twitter.com/KhaosT
https://twitter.com/stroughtonsmith
https://twitter.com/KhaosT