It is currently unknown exactly when Apple will release its next flagship device. Apple tends to prefer September for its release schedule, but last year's iPhone 12 was pushed back until October due to COVID-19. As of right now Apple is expected to stick to a fall launch for its lineup of next generation devices.
Early rumors have suggested that the ultra-wide angle lens on the iPhone 13 Pro and Pro Max will see and increase from the iPhone 12 model, and include a larger sensor. The aperture of the ultra-wide lens will allegedly increase from ƒ/2.4 to f/1.8. This and the larger sensor would increase image quality by allowing more light collection. It is unknown at this time which of the three cameras will gain a larger sensor, if rumors are true.
Apple discontinued Touch ID in 2016 with the iPhone 7, but recent rumors have suggested that it could be making a return in 2021. Analyst Ming-Chi Kuo claims Apple will release a lower-cost iPhone model in the first half of 2021 with a Touch ID power button on the side of the device. This rumored phone would not have Face ID and feature an LCD display. It is unknown if this model will be part of the extended iPhone 13 family or be named something like "iPhone SE 2 Plus."
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.
Little it known about Apple's next flagship device expected to be released in fall of 2021. It is even unclear if the new handset will be named the "iPhone 13" or if Apple will skip the unlucky number for something like the "iPhone 12s." No matter the name, it is still believed the iPhone 13 will follow the iPhone 12 in design. This means Apple fans can expect a 5.4-inch mini, 6.1-inch standard, 6.1-inch Pro and 6.7-inch Pro Max models to be released around September.