What I'd love to see more than anything in the 12" MacBook Air "stealth" is the entire area of its trackpad is invisibly and magically a Touch ID surface. Want to unlock your Mac? Place a finger on the trackpad. Want to buy an app or rent a movie on your Mac? Same. Want to log into eBay or Facebook or whatever? Simply place one finger on the trackpad. That'd be amazing!! It would change notebook computers forever.