Apple Watch Ultra 4 Rumored to Get Full Redesign and Sensor Upgrade

Apple is reportedly preparing a complete overhaul of its top‑end smartwatch. The leak, which first appeared on a well‑known supply‑chain forum, says the Apple Watch Ultra 4 will feature a brand‑new case shape, a larger display and a “significant upgrade to sensing functions.” If true, this would be the first major redesign of the Ultra line since the original model launched in 2022.

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What the redesign could mean

The current Ultra series uses a 49 mm titanium case with a flat‑top sapphire crystal. Analysts think Apple may move to a more rounded bezel and a slightly thinner profile to improve comfort during extreme activities. A larger display would allow a higher resolution UI, which is useful for detailed maps and health data.

A bigger screen also creates room for additional sensor hardware. The rumor mentions a “significant upgrade,” which could be interpreted in two ways:

1. New sensor types – Apple might add a dedicated blood‑glucose monitor, a skin‑temperature sensor, or even a small radar module for contact‑less heart‑rate measurement. These additions would bring the Ultra closer to a medical‑grade device.
2. Improved existing sensors – The current suite (optical heart‑rate, ECG, SpO₂, depth gauge, compass, and temperature) could be upgraded with faster processors, higher‑resolution ADCs, and better power‑management chips, extending battery life while delivering more precise readings.

Either scenario would likely require a new silicon generation. Apple’s custom S9‑class watch chip is already in the Ultra 3; a next‑gen S10 or S11 would provide the extra compute needed for AI‑driven health analytics.

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Impact on the supply chain

The rumor cites Taiwan‑Asia Semiconductor, Apple’s exclusive supplier for watch sensor components, as the beneficiary of the upgrade. A larger order book starting in July would align with Apple’s typical second‑half production surge, when the new model is expected to ship.

For the supplier, this means:

• Higher volumes of MEMS pressure and accelerometer chips.
• Potential new product lines for temperature and glucose sensing.
• A tighter schedule to qualify the components for Apple’s strict quality standards.

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Timing and ecosystem considerations

The leak hints that the Ultra 4 will debut in September, alongside the iPhone 18 Pro, iPhone 18 Pro Max, and the rumored iPhone Ultra. Apple is also expected to launch AirPods Ultra and a MacBook Ultra later in the year, suggesting a coordinated push toward a higher‑performance, premium‑focused ecosystem.

From a consumer standpoint, the timing matters because:

• WatchOS 11 is slated for release with the iPhone 18 series, bringing new health APIs that could take advantage of the upgraded sensors.
• Existing Ultra owners will face a classic lock‑in dilemma: upgrade now for the latest health features, or keep the older model that still receives software updates for several more years.
• Pricing is likely to stay in the €800‑€900 range, but a redesign and new sensors could push the list price above €1,000, especially if Apple adds a cellular‑only variant.

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How the Ultra 4 fits into Apple’s broader strategy

Apple has been positioning the Ultra line as the go‑to device for athletes, adventurers and professionals who need rugged durability and advanced health monitoring. By refreshing the hardware and expanding the sensor stack, Apple can:

• Differentiate the Ultra from the standard Apple Watch Series 9, which will continue to use the older chassis.
• Strengthen its foothold in the emerging market for wearable health diagnostics, competing with devices like the Garmin Fenix 7 and Samsung Galaxy Watch 6 Pro.
• Encourage users who already own an iPhone, AirPods and a MacBook to stay within the Apple ecosystem, since many health and fitness features sync across devices via iCloud.

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What to watch for

If the rumor proves accurate, the next few weeks should bring:

• Official renderings or a teaser video from Apple’s September event page.
• Leaked specifications from teardown sites such as iFixit once a prototype reaches the market.
• Early benchmarks of the new sensor suite, especially any glucose or radar‑based health data.

Until then, the community can keep an eye on supply‑chain reports and the upcoming WatchOS 11 beta, which may hint at the software capabilities that Apple plans to pair with the new hardware.

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For more on Apple’s upcoming hardware releases, see the official Apple newsroom.