Apple’s most significant product launch event in nearly a decade kicks off Monday, when the company will introduce its first major new product category since the Apple Watch in 2015 alongside multiple new Macs and new operating system versions of macOS, iOS, iPadOS, watchOS, tvOS, and the new xrOS to power the “Reality One,” “Reality Pro,” or “XR Pro” (mixed-reality) headset. Mark Gurman for Bloomberg News: Apple’s first headset will be an ultra-premium device made of glass, carbon fiber and aluminum. It looks like a high-tech pair of ski goggles, features a new magnetic charger for power, has a curved front with an external screen to show a wearer’s facial expressions and eyes, and several external cameras to enable video…