Some rumors show that it’s possible for next generation iPhone to have triple lens camera for this fall 2019. That model is now believed to be only for the next generation of the iPhone XS Max.
Here’s the photo and this is what it could look like. If those rumors are true, advantages of the third lens would have including advanced 3D sensing, increased optical zoom, improved low-light performance, and improved photo quality. Read more via the link for further information.