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 pointed to 4 new models dubbed the "iPhone 13" by the press. However, it is unknown if Apple will decide to skip the unlucky number for something else, such as the iPhone 12s or maybe even iPhone 14. The new lineup will mimic the iPhone 12 lineup, and will include an iPhone 13 mini, standard model, iPhone 13 Pro and iPhone Pro Max. The Pro lineup is expected to see an increase in photo quality with the addition of a larger sensor and aperture.
Other rumors have suggested the return of Touch ID with the addition of an under-display fingerprint scanner, a significant change in screen technology, and slight design changes.Nothing has been officially confirmed at this time.