Again this isn't new to Apple. They did this with the Plus model last year and also with Rose Gold too. So Apple doesn't really make enough.
The Jet Black was known to be a low stock. My buddy this morning got a email from with Apple store manager telling him that the Jet Black will be back ordered and some pre ordered from their end might not get theirs.
Re: Apple IPhone 7 / 7 Plus Reservation numbers / Questions
Anyone looking for a Jet Black for walk in will be out of luck from what Apple says. Also it will be hard to even get one..
" We couldn’t be happier with the initial response to iPhone 7 and iPhone 7 Plus, and we are looking forward to beginning sales through our retail stores and partners around the world.
Beginning Friday, limited quantities of iPhone 7 in silver, gold, rose gold, and black will be available for walk-in customers at Apple retail stores. During the online pre-order period, initial quantities of iPhone 7 Plus in all finishes and iPhone 7 in jet black sold out and will not be available for walk-in customers. Availability at partner locations for all finishes may vary and we recommend checking directly with them.
Customers can continue to order all models in all colors on apple.com. We sincerely appreciate our customers’ patience as we work hard to get the new iPhone into the hands of everyone who wants one as quickly as possible."