New iPhone 11 Pro delivery times already starting to slip
Certain models and colors of the iPhone 11 Pro are already selling out and Apple's estimated delivery times are being pushed further back into October.

Apple's iPhone 11 Pro delivery dates are slipping back
Within 45 minutes of pre-orders being made available, the new iPhone range was already beginning to sell out. Certain colors and capacities of the iPhone 11 Pro, in particular, were the first to see their estimated delivery dates slip from September 20 into October.
Apple's online store is offering the new phones in a total of 38 different varieties, ranging from colors to storage capacities and either unlocked or with particular carriers.
The first variety to see delivery dates slip to between October 4 and October 11 were the 256GB iPhone 11 Pro in Space Gray and Midnight Green.
Then iPhones that are locked to any of the supported US Carriers, such as AT&T, appear to be selling faster than unlocked ones.

Currently models in gold seem to still be available for September 20
While the situation is of course continually changing, it appears that if you want to get your iPhone 11 Pro on its September 20 release date, the best color to pick is gold. Currently you can get any capacity iPhone 11 Pro, locked or unlocked, on September 20 if it's gold.

Apple's iPhone 11 Pro delivery dates are slipping back
Within 45 minutes of pre-orders being made available, the new iPhone range was already beginning to sell out. Certain colors and capacities of the iPhone 11 Pro, in particular, were the first to see their estimated delivery dates slip from September 20 into October.
Apple's online store is offering the new phones in a total of 38 different varieties, ranging from colors to storage capacities and either unlocked or with particular carriers.
The first variety to see delivery dates slip to between October 4 and October 11 were the 256GB iPhone 11 Pro in Space Gray and Midnight Green.
Then iPhones that are locked to any of the supported US Carriers, such as AT&T, appear to be selling faster than unlocked ones.

Currently models in gold seem to still be available for September 20
While the situation is of course continually changing, it appears that if you want to get your iPhone 11 Pro on its September 20 release date, the best color to pick is gold. Currently you can get any capacity iPhone 11 Pro, locked or unlocked, on September 20 if it's gold.
Comments
The timestamp on my order is 7:10 a.m. CDT (actually less than 10 minutes before I could actually place an order on Apple.com; site was saying final updates were in progress). I ordered an iPhone 11 Pro, Space Gray, 256 MB, and the delivery window is October 1 - October 4.
Apple clearly has the hardware to blow google out of the water in computational photography, but it remains to be seen if they can match them on the software side. If Apple can do something analogous to what Google does to achieve a digital zoom far better than just a crop, then the telephoto in the Pro might not add much value.
Basically, google mimics what the human eye does to provide digital zoom -- they jiggle the lens to take multiple pictures from ever so slightly different angles, then combine the pictures to get a photo with effectively higher resolution than any single shot, and then they crop that effectively higher resolution picture for the zoom -- it's very effective. Apple should do that, and if they do, then I don't need the Pro.
Got other dunning letter again this morning.
Okay, let's see what they're offering.
Using the iPhone XS, I went through their upgrade ordering process. Apple said upgrade to the comparable iPhone 11 Pro 256GB Gold AT&T detecting I will be returning the XS. I pay monthly on the XS to Citizen's One now and to my shock, except for the immediate outlay of sales tax, I'll be paying $21 LESS per month to upgrade to the iPhone 11 Pro. Actually about $22 less because I get about $1 (3%) back for using the Apple Card to pay Citizen's One on the interest free loan.
I don't need a horse's head in my bed accept a deal I can't refuse.
I pick up my new phone at Sept 20 at 12:30 at the local Apple store.
Smoothest iPhone purchase ever, unless you consider my purchase two years ago through Verizon, when they "accidentally" started selling them 15 minutes early. I got ours ten minutes before 3 AM and enjoyed watching all the pissed people on Twitter who couldn't get through to Apple's site for an hour or more.