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Jefferson Graham previews new features expected on the next iPhone, on #TalkingTech.

SAN FRANCISCO — I-Day is Tuesday, we know that. But when will we be able to get our hands on Apple’s 10th-anniversary iPhones?

Apple is expected to unveil a top-of-the-line iPhone — dubbed X, according to last-minute leaks — at the Steve Jobs Theater at its spaceship-shaped Apple Park campus Tuesday. It will be joined by two less fancy models, iPhone 8 and iPhone 8 Plus, according to some reports.

The most richly-anticipated iPhone in at least three years (the big-screened iPhone 6 and iPhone 6 Plus debuted in September 2014), the new flagship comes with high expectations and a high price tag, reportedly $1,000.

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The iPhone 8 and 8 Plus are likely to be available on Friday, Sept. 22. The company normally makes its smartphones available about 10 days after they’re announced, if past history is any indication.

The sticking point this time, however, is availability for the top-of-the-line phone, which may be dubbed X.

KGI Securities analyst Ming-Chi Kuo, in a note on Monday published on the AppleInsider tech blog, warned a gold version of that new phone “will remain in severe short supply for awhile.”  He claims Apple is producing less than 10,000 units per day, and it may go on sale at a later date.

Apple’s anniversary phone comes with many features, including an OLED screen that could restrict supply. The ambition of the new phone — it reportedly comes with a major redesign, facial recognition, wireless charging and dual cameras — has led to production glitches that could delay widespread shipments anywhere from a few days to several weeks.

There aren’t expected to be shortages of the lesser models, the iPhone 8 and 8 Plus, which have LCD screens, according to AppleInsider.

“Apple’s new iPhone lineup presents a difficult marketing challenge of which I’m not sure how they are going to approach this problem,” says Daniel Ladik, a marketing professor at Seton Hall University. “Demand should be off the charts, but what if Apple doesn’t build enough of the new phone, especially with the holiday season around the corner?”

“Wall Street will not look fondly…