Why iPad Pro won't replace any of your current gadgets

At its huge new product event last week, Apple's Senior Vice President of Worldwide Marketing Phil Schiller said the forthcoming iPad Pro can "do things a notebook can't.” But can the large tablet really replace a notebook? Can it even replace an iPad Air 2?
Schiller said the iPad Pro lets you do things you can't on a laptop or desktop PC, and as an example, he showed a demo of the iPad Pro's big touch screen being used to play a piano keyboard. (Of course, you can also do this with