An almost unimaginable number of phones: 41 million last quarter, 78 million in Q1 - that averages out to around 6 phones a second, 24/7/365 (and the rate would have to be even higher if the plants aren't running every second of every day). That's, on average, over half a million completed, tested, boxed, iPhones a day, every day (even just physically carting that many phones away from the factories would be an enormous task). Which means, every necessary part has to arrive at that rate of about half a million a day. Every complex machining step (milling out the frame of the phone, etc.) has to happen at the rate of half a million a day. The OLED screens they want, at the quality and specifications they want, aren't available at that volume. I think that's a big part behind splitting the line, this year, into regular and super-deluxe-extra, so they can build the iPhone equivalent of a Ferrari, at, say, thousands a day, out of parts that are harder to get (and more expensive), along with still building a 7s at half-a-million a day.
A lot of people here are treating it like the 8/Edition is the only worthwhile phone that will be announced next week, and it's some sort of crime if the price is over $1000, since previous iPhones haven't been that expensive. But the whole point is, the 8/Edition isn't like previous iPhones. The 7s is the successor to the 7, the 8/Edition is a Ferrari, ogled by many, bought by few. Normal people (as opposed to us, people who hang out in the comment sections on tech rumors sites), are going to say, "Oh, the Edition looks nice - $1200? two month wait? uh, yeah, not for me, I'll get a 7s", just the way most normal people don't buy Ferraris, even if they think having one would be fun. I'm expecting to buy a 7s to replace my 6. It'll be way faster, have more memory, a better screen, better camera, better water resistance, and so on. And it'll sell for normal iPhone prices. In every way a fantastic upgrade. I'll definitely try out the Edition at the Apple Store, but I don't expect to buy one.
What would really suck about this x edition? If it had a big spec increase, much like the 7S hopefully will. And that complete design overhaul. Which is what people have been asking for, but won't be obtainable because it's the new as you say "ferrari" of phones.
I'd be fine if it was something that was bigger, had an oled screen, maybe bigger storage and added abilities such as (better viewing in the sun, actual water resistance, better speakers, etc) but I'm going to go nuts if it has a better camera than the 7S.
Which it most likely will