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Apple's foldable "iPhone Ultra" may launch in mainland China later than in some other markets, according to an oft-reliable Chinese leaker. Posting on the Weibo social media platform, Instant Digital said that Apple has a limited initial inventory for its first foldable device, and the rollout could be shaped by regional allocation.

The device represents the biggest single design change in the nearly 20-year life of the iPhone, which accounts for roughly half of Apple's sales. 

The foldable will be a test for Apple, which has not launched a breakout hit since the AirPods 10 years ago.

Following some recent speculation that Apple could release its foldable phone under the "iPhone Duo" name, it appears that will indeed be the case, according to Bloomberg's Mark Gurman. For months now, the foldable iPhone has generally been referred to as the "iPhone Ultra," even internally, but Apple is apparently going in a different direction for the official name, emphasizing the dual-screen nature of the device.