The Moto Z3 was something of a flop last year, and Motorola will be hoping to make up for that with the Z4 this year. Renders of what appears to be the Moto Z4 have surfaced, showcasing the device with a waterdrop notch and, rather bizarrely, just one rear camera.
https://www.notebookcheck.net/Renders-of-the-Moto-Z4-surface-Just-one-rear-camera-on-board.414814.0.html