They almost certainly have something their sleeve to hype that they can claim competitors don't have. If they just make the screen bigger and some minor changes to the case, they will just be seen as playing catch up.
Those are all relatively absurd examples. They tried the integrated-service route with Ping, and it was an unmitigated failure. What could they possibly do with the sound or the material?
Something tells me I'm going to be severely underwhelmed in a week or so.
Of course that's complete nonsense, as even 4" is quite tiny for a touchscreen, but hey that's what they said! And that's what they thought.
Those people would've said 2" or 6" was the perfect size, if that was what Apple had decided on. I don't think their opinions are worth that much.
Apple does get a lot of things right but some people mistake that for perfection.