After scanning the QR code with your smartphone or tablet, you will be taken to a website that offers more information about the crash. At the moment, it's still a work in progress though:
Right now, it just points to windows.com/stopcode, which explains typical Blue-Screen-of-Death causes, but in future it could contain detailed information about the crash – or something a little more user-friendly than something like MACHINE_CHECK_EXCEPTION.
Via: The Register