Apple expected to unveil sleek, pricey headset. Is it the device VR has been looking for?

File - Apple CEO Tim Cook discusses the Apple Watch at the Apple event at the Bill Graham Civic Auditorium in San Francisco, Wednesday, Sept. 9, 2015. If Apple unveils a widely anticipated headset equipped with mixed reality technology on Monday, it will be the company's biggest new product since the introduction of the Apple Watch nearly a decade ago. (AP Photo/Eric Risberg, File)