Apple will announce its flagship OLED iPhone in September, but ship it in October — still potentially achieving impressive sales, according to an analyst memo obtained by AppleInsider.

The delayed shipment is because of "challenges with the OLED curved screen," said Gene Munster of Loup Ventures, citing a talk with a component supplier. As result, the analyst is calling for shipments of 39 million iPhones in the September quarter — well below a Wall Street consensus of 49 million, as well as the 45.5 million phones Apple shipped in the Sept. 2016 quarter.

Munster anticipates 6 million shifting into the December quarter, however, and an extra 4 million in the March quarter, with supply and demand only then balancing out. The analyst suggested in fact that while the iPhone 7 cycle will likely generate flat unit growth versus the iPhone 6s, the next iPhone cycle should see an an 8 percent rise.

Revenue is meanwhile predicted to grow 11 percent, mainly due to a higher average selling price spiked by the OLED iPhone, commonly referred to as the "iPhone 8." The figure should increase from $651 to $674, Munster said, working on the assumption that the new phone will cost over $1,000.

"This new high-end SKU should run about $47 per month on the iPhone upgrade program, compared to $41.58 today for the entry level iPhone 7," he wrote.

Interest is reportedly higher in the "iPhone 8," based on a Loup survey of 501 people in the U.S. conducted the weekend before Apple's recent Worldwide Developers Conference. Of 220 current iPhone owners, 25 percent said they were planning to buy the next iPhone at launch — a jump from 15 percent in a July 2016 poll.

Of the people planning to upgrade, 54 percent said they were interested in augmented reality features, despite the survey coming before Apple's ARKit announcement on June 5. It's uncertain what sort AR-related hardware the "iPhone 8" might have, but ARKit will give developers software tools for bringing the technology to iPhone and iPad apps.