If the myriad rumors and reports are to be believed, the next major iPhone evolution won't take place until 2020. This year's iPhone will certainly be a step up, but far more dramatic changes are coming next year. One of those changes will apparently be a time-of-flight 3D rear camera, according to a new DigiTimes report.Sources tell the site that Apple is working with supply chain partners to bring vertical-cavity surface-emitting laser (VSCEL) components to future iPhone models. This is the same technology that powers Apple's TrueDepth camera system, which is already present in the front-facing cameras of current iPhones. Including the technology in the rear cameras as well could open up a whole new world of possibilities for augmented reality.This isn't the first time such an upgrade has been hinted at either. Late last year, TF International Securities analyst Ming-Chi Kuo said that the 2019 iPad Pro would feature a 3D-sensing camera. He has also said more than once that time-of-flight will come to the iPhone in 2020. Bloomberg's Mark Gurman and Debby Wu published a similar report in January, stating that Apple will launch iPhones with "a more-powerful 3-D camera" in 2020.As the Bloomberg report pointed out, the current TrueDepth system, while relatively advanced, is only able to operate within a few inches of its intended target (which makes sense for a selfie camera). The new system will reportedly be capable of working up to 15 feet away from the target, which is a substantial upgrade.In the meantime, Apple has another camera upgrade in store for the iPhone 11. Countless leaks have reiterated that the iPhone Apple plans to unveil this September will feature a triple-camera array on the back of the device, as the company finally catches up with many of its Android rivals that added an extra camera years ago.