An Apple Support Page dedicated to showing users how to place two nano-SIM cards into an iPhone includes an image showing a flat-edged iPhone, which could potentially be an iPhone 12 model.
As you can see in the image above, the article is detailing how to use dual-SIM with two nano-SIM cards, but the iPhone on the right that the SIM card tray is from has flat edges, similar to the design of the iPad Pro.
It is unknown if this is an accidental glimpse at the iPhone 12 from Apple or if this is just a generic mock-up of an iPhone, but if this an accidental glimpse at the iPhone 12, this could provide great insight into how the iPhone 12 will look with an iPad Pro-esque design.
This is not the first time that Apple Support has accidentally leaked a future product. A few months ago, a video uploaded to the Apple Support YouTube Channel showed the word “AirTags” under one of the menus in the Settings app.