While we don't know anything officially about the iPhone 13 design, early rumors have already suggested that Apple is planning a slight change in the next-generation form factor. According to the Japanese outlet Mac Otakara, the next iPhone will feature a thinner notch at top and slight increase in thickness.
Like the iPhone 12, Apple is allegedly planning to release 4 iPhone 13 models, but will increase the overall thickness by approximately 0.26mm. The rear-facing camera will also see a slight bump by 0.9mm and protrude slightly less than it predecessor.
There have also been rumors floating around that Apple may go with an entirely notchless and portless design putting an end to the Lighting connector. If true, all these slight design changes mean you'll be in the market for a new case if you plan to upgrade from the iPhone 12 in 2021.We should know more near the falls as the iPhone 13 (or whatever it's called) nears its official release.