There is no chance they call it iPhone Pro. That is absolutely TERRIBLE marketing.
Pro tells customers nothing about this phone except it's speedy for professionals. That's what customers hear when they hear Pro. Idiotic marketing for this phone.
What you want to do is draw customer attention to NEW features. How do you do that? You give it a name that makes customers intrigued to find out how it is different; to ask questions.
As an example, if it has wireless distance charging a great name would be 'iPhone Air'.
You're right that it won't be called iPhone 8, but that's just a placeholder name. It definitely won't be 'iPhone Pro'. Another reason you know it won't be iPhone Pro is because next year there will be a PLUS-sized OLED model with the same design, so in your naming scheme you'd have:
iPhone Pro
iPhone Pro Plus (or Plus Pro)
Both of these are the most awful names ever.
Anyway, glad I convinced you now.
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It's actually the intelligent way to do the Home Button.