This comes from a paywalled Wall Street Journal article (via Pocket Lint ), which states that Apple is considering a price increase due to "new features and design changes".

Apple may be gearing up to raise the prices of its next-generation iPhones, but it's treading carefully to avoid pinning the hikes on US-China trade tensions, according to a report by The Wall Street Journal.

Apple reportedly plans to increase the prices of its fall iPhone lineup despite the recent tariff truce between the U.S. and China.