According to the model disclosed by the source Majin Bu, Apple plans to launch the iPhone 15 Ultra Extreme Edition on top of the two iPhone 15 Pro models this year, and the price will be based on the Pro model. Increase it by another $100.

Majin Bu’s tweet as follows:
According to the latest news I have, Apple will adjust the lineup of the iPhone 15 series.
Apple will launch an iPhone 15 Pro Max model, but with 6GB of RAM and up to 1TB of storage.
On this basis, Apple will launch the iPhone 15 Ultra, equipped with 8GB of memory, up to 2TB of storage, better camera features, and a $100 price increase.
In a follow-up tweet, he shared some screenshots from protective case manufacturers for evidence, and said that there will be 5 models this year, and the Pro Max is not the top model.
However, he also expressed in his tweet that he is not sure about this revelation. It may be that the accessory manufacturer cannot confirm the Pro Max and Ultra models, so he just put it up.
In his tweet, he said that Apple is indeed testing two 6.7-inch Apple iPhones internally, but the possibility of launching them at the same time is unlikely.