Apple Watch Ultra 4 Could Be Apple's Biggest Surprise This Year

Apple's September Event Is About to Get Even More Exciting

Every September, Apple dominates the tech world with its biggest announcements, and this year is expected to be even more exciting. While the foldable iPhone and the AI-powered features in iOS 27 will likely grab most of the attention, another product is quietly building massive hype. The Apple Watch Ultra 4 could end up being one of the biggest surprises of Apple's entire event. If the latest leaks are accurate, this won't be a simple yearly refresh it could be the biggest upgrade the Ultra lineup has ever received.

A Major Redesign Is Finally Coming

According to a new DigiTimes report, Apple is preparing a "major" and "full" redesign for the Apple Watch Ultra 4, which is expected to launch alongside the iPhone 18 Pro and the all-new iPhone Ultra this fall.

While the report doesn't reveal the exact changes, previous leaks suggest Apple is working on a slimmer and lighter chassis without sacrificing the rugged durability that made the Ultra series so popular. The company is also rumored to be redesigning the sensor layout on the back of the watch while introducing a more power-efficient battery. If Apple manages to make the Ultra 4 thinner, more comfortable, and longer lasting, it could be exactly the upgrade Ultra users have been waiting for.

Smarter Health Sensors Could Be the Biggest Upgrade

The real story may be happening inside the watch.

Apple is reportedly introducing upgraded health sensors that could unlock a more advanced blood pressure notification feature. Instead of simply measuring heart rate, the Apple Watch Ultra 4 may analyze how your blood vessels respond to every heartbeat using its optical heart-rate sensor. If the system detects abnormal patterns that may indicate high blood pressure, it could alert the user and recommend seeking medical attention.

Apple already introduced Hypertension Notifications with watchOS 26, but this new version is expected to be more accurate and reliable thanks to improved hardware.

There's One Important Catch

As exciting as the feature sounds, it may not be available immediately.

Reports suggest Apple's new blood pressure notification system is still under review by the U.S. Food and Drug Administration. Until it receives regulatory approval, Apple cannot officially release the feature. That means the Apple Watch Ultra 4 could launch first, with the health feature arriving later through a software update.

Apple's Bigger Health Mission

Blood pressure monitoring is only one piece of Apple's long-term health strategy.

The company is still developing non-invasive blood glucose monitoring, one of the most ambitious features ever attempted in a smartwatch. While recent reports suggest Apple hasn't achieved the breakthrough needed to launch it this year, the upgraded sensors inside the Apple Watch Ultra 4 could be laying the groundwork for future generations.

Apple Expects Strong Demand

The DigiTimes report also claims these upgrades could increase Apple Watch Ultra shipments by as much as 30%compared to 2025. That's a significant prediction and shows Apple is expecting strong demand if the redesign and health upgrades deliver as promised.

Meanwhile, the Apple Watch Series 12 is expected to receive improved sensors but very few visual changes. Samsung is also rumored to be refreshing the Galaxy Watch Ultra 2, although its upgrades are expected to be relatively minor.

Final Thoughts

A redesigned body, smarter health sensors, improved battery efficiency, and Apple's continued focus on advanced health tracking could make the Apple Watch Ultra 4 the biggest Ultra upgrade yet. Of course, nothing is official until Apple unveils it this September, so these reports should still be treated as rumors.

But if even most of these leaks turn out to be true, the Apple Watch Ultra 4 could steal the spotlight from Apple's foldable iPhone and AI announcements and become one of the most exciting smartwatches the company has ever released.