It's not going to matter for most iPhone users. The vast majority of iPhone users don't see the leaks, nor do they watch the September presentation. For those of us that do, it's mixed. Some like to be surprised, others don't care. It doesn't matter to me how and when I see what's new.
Everything will be listed by what tech media heard, think, suspect, made up on the 15 pro. So how could there be any surprise? But oh wait, they still don’t get everything (dynamic island, pricing) and then there’s what they get wrong.