According to Taiwanese analyst Ming-Chi Kuo, often well informed about the future of Apple products, the new iPhone 15 Pro and Pro Max for the start of the 2023 school year will have at least USB 3.2 or even Thunderbolt 3 compatibility via their new USB port -C which will replace the Lightning port (thanks Europe).
iPhone 15 Pro and Pro Max, tenfold transfer speed
At best, the Thunderbolt 3 offers a speed of 40 GB/s, compared to the old Lightning which reaches 480 MB/s on current iPhones. Even with USB 3.2, the next iPhones will have a higher transfer speed, between 5 GB/s and 20 GB/s. A significant time saver, especially when converting large photo files to the new Pro Raw format.
iPhone 15 and iPhone 15 Plus capped at USB 2.0
Note that the "standard" iPhone 15 and iPhone 15 Plus models will keep the old USB 2.0 standard and will therefore not have the new transfer speed of the Pro models.