https://wccftech.com/iphone-2019-rumor-triple-lens-camera-with-advanced-3d-sensing/

This is not the first time that the iPhone 2019 family has been rumored to feature a triple-lens camera solution. The 2018 lineup will include two devices with two cameras at the back side, most likely resulting in 2x optical zoom with greater color accuracy in a variety of environments with minimum image quality loss. However, the series that will be arriving in 2019 will pack some major hardware upgrades on the optics side.

Sadly, we will have to wait a whole year from Apple to bring an advanced triple-lens camera to an iPhone. After all, the P20 Pro from Huawei already sports this and we are more than confident that the Mate 20 Pro will come armed with the same number of lenses, but with better imaging hardware than before.