A pretty safe bet at this point is that Apple is going to launch three new iPhones near the end of 2019, and that at least one of them is going to have a square camera housing design on the back. It's even possible more than one does. But the iPhone 11 Max (or whatever Apple calls it) is shown off in new renders with that rear camera design in full focus.
iPhone 11 Max case renders show off a square camera bump and more