The Apple Watch Ultra 3 is easily one of the best smartwatch models in 2026 and Apple’s best smartwatch for battery life, but that hasn’t stopped the rumor mill from churning out potential Apple Watch Ultra 4 upgrades. In fact, a new Ultra model could debut as soon as this fall.

I’ve been tracking all Apple Watch Ultra 4 rumors ever since the arrival of the Ultra 3 last fall, and there are quite a few juicy ones to chew on, including hints of a massive redesign, new health tech, and even better battery performance.

Here’s everything we think we know about the Apple Watch Ultra 4, so far.

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Digitimes, it’s totally possible!

What might that entail? Rumors suggest a thinner case, at the very least, while a deep dive done by 9to5Mac hints at the possible addition of a fingerprint scanner on the Ultra 4 as an alternative to passcodes to lock your device.

Digitimes.

Like Hypertension Alerts on the Ultra 3, this new bit of tech is rumored to use the optical heart rate sensor to track how your blood vessels react to individual heartbeats. Presumably, it will do so with better accuracy than currently available, but it’s unlikely that it will be able to provide a numeric blood pressure reading like a traditional cuff.

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It also doesn’t seem likely that non-invasive blood glucose monitoring — a holy grail for the wearables industry — will be ready in time for the Ultra 4’s launch, but we know Apple is hard at work on such a feature.

Digitimes also reports that the number of sensors in the Ultra 4 will be double that of the Ultra 3, but we don’t know whether that refers to holistic sensors, fingerprint reading sensors, or both.

Apple Watch Ultra 2 to the Ultra 3 was pretty minimal: 36 hours vs 42 hours. Might the Ultra 4 boast even better longevity?

Here’s hoping. While little is known about the physical battery in the forthcoming watch, the Digitimes report suggests that the new device will see at least modest improvements in power efficiency, which could potentially lead to substantial longevity gains… or not.

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