Apple’s Worldwide Developer Conference is right around the corner, and so is one of the most significant launches the company has made in years — a mixed reality (MR) headset. It’s an entirely new product category for Apple, which finds itself in completely unchartered territory. When stuffing smartphones into VR headsets was all the rage back in 2016, Apple was more focused on augmented reality (AR) with its ARKit applications. But a secret project was brewing at Cupertino, the culmination of which is what we’re about to witness.