A VCSEL flight time is similar to the infrared TrueDepth camera system found in iPhones today on the front of the device, enabling Face ID. Adding such a 3D sensing system to the rear camera will allow for higher fidelity 3D photo shoots, and potentially open up new augmented reality opportunities.
Apple's current 3D technology, TrueDepth, uses a single VCSEL to project structured light into a subject. As AppleInsider notes, by measuring deviations and distortions in the web, the system is able to generate a 3D map which in this case is used for biometric authentication.
Kuo also states that Apple will stick to Face ID in 2020, and predicted that Apple will introduce three new iPhones in 2020 with Face ID support. He also believes that the tech giant will ship 45 million such iPhones by the end of 2020.