Well this is awkward. Somebody at Apple jumped the gun on the MacBook Pro in an Apple Pay support document, including a picture of tomorrow's new laptop that gives away most, if not all of its secrets.
So here then is the Magic Toolbar - as previously suggested its an OLED touch screen with an embedded fingerprint sensor which will mimic keys and display relevant information to the application or service in use.
The embedded fingerprint sensor will allow Apple Pay on the web, as well as system and application log in.
Presumably this technology will make its way to other Apple laptops too, given that the presence of a Touch ID sensor on the Mac opens all sorts of opportunities for Apple in the financial sector.