Apple is separating the new smartphones into its usual low-cost versus high-cost categories, with big differences between the two models coming down to the camera, display, and battery life.
iOS 13 & watchOS 6 Now Available
Alleged iPhone XI and XI Max Molds Show Triple Camera Layout
These physical molds are presumably produced by case manufacturers based on leaked schematics to test early cases for the upcoming 2019 iPhones.
The front design is also shown on a Weibo post which may have been the original source for the images:
The square grouping of the triple-camera is consistent with other rumors and images that have leaked from the supply chain regarding Apple's upcoming iPhones.