I think you'll be very surprised at how successful this is.

Do you remember the Microsoft prototype for a folding tablet? It would have two different apps running, and you could use the spine to pull data between them, a kind of visual clipboard.

I don't think that workflow is as important now, but having two apps open (one on each side of a device) is going to be killer, and it's something they're clearly hinting at with some of their asks for developers (and with their iPad OS).