In addition to the leaves maybe turning colour and the chilly weather, there are three additional things you can anticipate.
USB-C is a welcomed addition
With the official abandonment of its exclusive Lightning port in favour of the more versatile USB-C
Don’t discount the ‘Dynamic Island’
The "Dynamic Island," which has been added to all four versions, has taken the place of the notch on the top of the iPhone 15 and iPhone 15 Plus models.
Better cameras in the Pro models
The 48-megapixel camera on these high-end iPhone 15 models is identical to that on the iPhone 15 and iPhone 15 Plus.
What is so special about the iPhone 15?
Is it sufficient to upgrade? No, not at all. I contend that it's more of a "nice to have" function than a "need to have."