The iPhone 15 is more than a year away, so nothing is set in stone yet, but USB-C, periscope camera technology, and an Apple-designed modem chip have been suggested. This roundup covers everything that we've heard about the iPhone 15 and iPhone 15 Pro so far, but keep in mind that it's early in the development cycle and Apple's plans could change.

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Rumors suggest the iPhone 15 models will look similar to the iPhone 14 models, but the pill-and-hole cutout will expand to the entire lineup. That means all iPhone 15 models would have no notch, instead adopting the two cutout design rumored for the iPhone 14 Pro models.

There have been some rumors suggesting an under-display Face ID system could be introduced in 2023 in the iPhone 15 Pro models, but it is unclear if that information is correct as other sources like display analyst Ross Young have said that under-screen Face ID simply won't be ready until at least 2024.

As there are no major design changes expected, Apple will likely continue to offer four models: The 6.1-inch iPhone 15, the 6.1-inch iPhone 15 Pro, the 6.7-inch iPhone 15 Max, and the 6.7-inch iPhone 15 Pro Max. The "pro" models will have higher-end features and will be more expensive, while the standard iPhone 15 models will be cheaper.

Apple is considering swapping the Lightning port on the iPhone 15 devices for a USB-C port, which would allow it to comply with European regulations that are in the process of being passed. These regulations would require Apple to produce iPhones with USB-C ports in Europe, so Apple either needs to make a worldwide design swap or develop special iPhones for sale in Europe.

Reliable sources that include Bloomberg's Mark Gurman and Apple analyst Ming-Chi Kuo have said that Apple is going to make the swap, so this is a strong possibility at the current time. Of course, Apple's plans could change.

There have been multiple rumors about Apple's work on "periscope" telephoto lens technology, and this type of lens could be introduced in the 2023 iPhones, likely in the iPhone 15 Pro and Pro Max.

Periscope lens technology offers optical zoom capabilities that exceed those possible with a standard telephoto lens, allowing for 5x or even 10x optical zoom. With a periscope lens, the iPhone's zoom capabilities would be significantly enhanced as the current Pro models are limited to 3x zoom.

Apple competitor Samsung has come out with smartphones that use periscope lens technology that enables 4x to 10x optical zoom and up to 100x digital zoom.

For the past few years, Apple has been working to develop modem chips in house, and 2023 is when we could see Apple-designed chips debut. Right now, Apple is using modem chips from Qualcomm, but after a legal dispute back in 2019, Apple is eager to stop purchasing Qualcomm chips.

In November 2021, Qualcomm's CFO said that Qualcomm expects to supply just 20 percent of Apple's modem chips in 2023, and as Apple has no other modem chip supplier, that suggests Apple's own modem technology is nearing launch. Apple analyst Ming-Chi Kuo has claimed that Apple's chips could debut in the 2023 iPhone models.

We don't know anything about Apple's modem chips at this time, but presumably the technology will be on par with or better than the 5G chips that Qualcomm is producing if the A-series and M-series chips are any indication.

The iPhone 15 models could be the first to feature an A-series chip built on Apple supplier TSMC's next-generation 3-nanometer node. 3nm chip technology is expected to increase processing performance by 10 to 15 percent, while also reducing power consumption by up to 30 percent.

The iPhone 15 models will likely be released in September 2023 if Apple follows its traditional September launch timeline.