Apple is turning back to curved edges for the sides of the iPhone 15 models while the displays themselves will remain flat and not curved.
One rumor is that Apple would increase the maximum brightness to 2,500 nits for the iPhone 15 Pro Max, which might see the largest upgrade to its display.
Apple may use a bigger Sony sensor that measures over an inch in diameter. Images should become more vivid and vibrant as a consequence.
Expect Apple to keep with the trend it started with the iPhone 14 models last year. The basic iPhone will use the system-on-chip that powered the Pro models from last year, while the Pro models will use a more recent version of Apple's mobile silicon.
Since Apple is said to be experimenting with a stacked battery architecture that enables higher-capacity cells to fit into the same area, all four iPhone 15 models are anticipated to include bigger batteries than their iPhone 14 counterparts.
Regardless of the iPhone 15 model you choose, iOS 17 will already be loaded.