It's a given that the next iPhone is USB C. Notice that the Vision Pro also uses USB C. And for extra evidence, take a look at this Unbox Therapy short where he shows us a mold of the new iPhone 14. You can clearly see a USB C Port.
Having said that, I may be in the minority on this, but I'll miss Lightning. It's just such a small, elegant connector. It doesn't have a "tongue" like USB C so it's easier to clean both the male and female ports. USB C is great and all, and I know it has more capabilities with more pins and everything, but man I've really liked Lightning.