It was a bit surprising that the iPhone 15 launched without PRODUCT (RED) as one of the available colors. Instead, it launched in six colors: blue, pink, yellow, green and black.

It is definitely not an iPhone 15 Plus, but beyond what can be visually determined, there is no information. It could, of course, be the (PRODUCT)RED iPhone 14. That would be mean, though.

iPhone SE (2nd generation, 2020): the (PRODUCT)RED line made its debut with Apple's budget-priced phone. iPhone 12 and 12 mini (2020): the distinct (PRODUCT)RED in big and small packages.