John Gruber wrote this four days before the iPhone announcement:
I detect an undercurrent of sentiment that if Apple announces the iPhone 4S, it’d be a letdown, but if they announce the iPhone 5, it’d be exciting. But this is all merely about how the thing looks on the outside. A new form factor would by definition bring more “new-ness” to the announcement, but why should an iPhone 4-lookalike “iPhone 4S” be considered disappointing if it contains significantly improved components? The iPhone 4 is, I think it fair to say, the most popular device Apple has ever made.
You may not believe Gruber’s comment that he didn’t have inside information about the actual phone itself, but you have to give him credit for nailing this four days before the announcement. Pretty much spot on.