Users report overheating issues with iPhone 15

Some reports show that new iPhones are overheating under excessive loads. These reports include both Pro and non-Pro models.

iPhone 15 overheating | Infrared images of an iPhone 15 Plus - 9To5Mac

There is no clear indication on the actual issues and how are those affecting day-to-day use.

At this moment there are no comments from Apple on significance of the issue.

Apple Developer: thermalState