As with the majority, I can't imagine I'd pay it. They'd have to pull more mojo out of the hat than the rumor mill is suggesting before I change my mind. But this is Apple, and getting us to salivate is one of their specialties.
I figure my next iPhone will "need" no more than 128GB storage - my 64GB iPhone 6 still has plenty of available space, even after all these years. So, I wouldn't pay a premium for a phone that starts at a 256GB minimum, no less 512GB.
I'm looking forward to having new camera features, but since I also have a "serious" camera, I might be better off spending the difference on a lens or new camera body.
In the circles I travel in, nobody's going to say "Oooh" and "Ahhhh" when I whip it out - they just won't know the difference. I certainly wouldn't "educate" them on how cool it is - they'd undoubtedly ask off-topic questions. "Look at what the camera can do!" "Can it print Avery labels?" "Show me how to Twitter!"
I might geek out for a while on having a new toy, but a special, premium finish is going to be hidden behind a protective case anyway, and I'm not the type to ask, "Mirror, mirror on my phone..."
Now, presuming the 7s doesn't have facial recognition, and the 8 does... I know I can get by very, very well with Touch ID, so a 3-D sensor would have to do more than just replace the Home button (I expect it will, and thereby exceed our expectations and make it a greater object of desire... but my imagination is not up to the task).
All that said, I did get the 12.9" 1st Gen iPad Pro (Smart Keyboard and Pencil), even though a garden-variety iPad would have been a fine replacement for my 1st Gen iPad, so I'm not totally immune to the Sirens' song. And it'll only be about $50 more per month on the installment plan... So I reserve the right to vote one way, and act another.