Lewis Hilsenteger of the famous Unbox Therapy YouTube channel has been sent what is described as an authentic dummy unit of the hotly-anticipated iPhone 13 Pro Max. Should this be the case, the purported top-end device has not changed much compared to its predecessor - except that it might be slightly thicker, have larger rear cameras and rock the rumored smaller notch.
https://www.notebookcheck.net/An-alleged-iPhone-13-Pro-Max-replica-features-on-a-prominent-tech-YouTube-channel.537462.0.html